The 'please' sticker Mabel placed on the cash register in "Boss Mabel" is gone for the entire episode.
Mabel pulls the poster of her, Dipper, and Stan as a band out of nowhere.
When Wendy comes into the Mystery Shack after Stan, Mabel, and Dipper are announcing the After-Party, her horn still sounds despite the button not being pressed.
When Wendy enters the shack at the announcement of the after-party, she is wearing her name tag. However, while she is leaving with the crowd, her name tag is not seen.
When Soos sees the government agents pull up, they park outside the gift shop's side window. When the agents leave, their car is parked in front of the gift shop.
When the agents pull up, there's a bumper sticker on the rear bumper. When they drive away, it's not there.
When Agent Trigger points and says, "We're taking these as evidence," the bobble heads should have fallen to the floor.
Stan pulls the Contraband box out of nowhere.
When Dipper and Mabel are in the attic, and Mabel is claiming that there is nothing left to discover about the journal, there are only watermelon seeds on the neck and sleeves of her sweater; the front of the sweater is completely missing the watermelon seeds.
In the shot of the teens dancing, Tambry is wearing her regular day wear instead of the party outfit shown earlier.
When Lee, Nate, Tambry, and Thompson arrive at the party, Lee is wearing a sleeveless shirt. In the next shot, it has short sleeves. When all four are seen dancing, he is sleeveless again.
During the rap scene, the number of Sheriff Blubs' fingers changes.
Lazy Susan's lipstick is missing in two scenes; one where she is entering the Mystery Shack with a pie, and when the ground is shaking from the zombie invasion.
The mess Grenda makes moves when she, Candy, and Mabel are dancing.
The spell Dipper reads from the journal has some Latin words, but are in the wrong declensions and genders.
Dipper mispronounces the spell he uses to raise the dead. In the journal, the incantation's second line reads "Diablo Dominium," but Dipper reads it as "Diablo Dominus."
Agent Trigger and Agent Powers switch places from when Dipper says the curse to when the zombies attack.
The karaoke machine changes places, and even disappears, many times when the zombies are starting to attack the shack.
Mabel's hair poof color changes multiple times, from brown to pink, when the zombies attack.
During one of the shots after the zombies destroy the golf cart, some colored lights can only be seen for one shot above the horde with Soos, as well as some orange and yellow flags.
When Stan is talking to himself about Dipper in his underground lab, the desk, which presumably showed Stan's tattoo, looks different. The altocumulus cloud-looking symbols are upside down and connected to the main body of the symbol, and there are circles in the middle of the outward pointing arrows.
When Stan sees himself in the reflection of 1's hand, the reflection is not reversed.
In the same scene, 1 is shown with a monocle and ripped back cover, which are unique to 3.
The glass from the window that Soos smashed disappeared from the floor when a zombie breaks through the wall.
The TV was on a static channel before and when Soos sits down he says its on Gossiping House Wives.
Journal 3 claimed that zombies were invincible, except when subjected to a three-part-harmony. However, Dipper, Mabel and Stan kill many, usually by decapitation, skull-crushing or severing their spines.
Stan & Mabel's microphones aren't plugged in when they are singing.
Whenever Love Patrol Alpha starts to sing together and shatter the zombies brains, the karaoke machine says "We're taking over the dance floor! (Instrumental.)" But whenever it says instrumental, that's the chorus.
During "Taking Over Midnight," when the three are singing "We're queens of the disco!", Dipper steps up, followed by Mabel and then Stan, but when the camera zooms out, the order changes to Dipper, Stan and then Mabel.
After singing "Taking Over Midnight" by &NDRA, Stan's fez appears while yelling "Deal with it zombie idiots!" It then disappears again in the next shot.
The sun started rising after they song "Taking Over Midnight" by &NDRA but the party started at 8:00 PM, so there is no way the party could last about eight hours.
Stan activated the Universe portal in "Gideon Rises" by pushing the lever in front of it to the left. But during a full shot of the portal room at the beginning of this episode, the lever is seen facing the right.
When Agent Powers and Agent Trigger look at their screen after Stan activates the portal, Agent Powers sits left and Trigger sits right. They change while the map appeared.
Wendy has two left arms when she reaches for some popcorn.
In the same scene, in one frame, Dipper's mouth is completely displaced from his face.
The stuffed animal Wendy pulls from her bed's corner wasn't there in the previous scenes, nor shows up again in the following scenes.
The machine in the tree is about a foot higher than in the first episode of season 1.
The map of Gravity Falls changes in size.
Wendy didn't hear Mabel and Dipper talking when they were only a few feet apart.
Wendy magically ended up next to Dipper after he was done pacing.
Even though the Shape Shifter turned into a Hide Behind, the journal had no clear picture of it.
The Shape Shifter as the rolling thing chasing Wendy and Dipper was much closer than a few scenes later.
The scar from Wendy's ax disappeared when Wendy and Dipper are pushing the Shape Shifter into the freeze chamber.
Wendy's torn sleeve is only a few centimeters shorter than the non-torn sleeve.
At the end of the episode, several fireflies are seen buzzing around, despite the fact that fireflies are not native to Oregon.
In the scene in which Dipper is going to find another way out of the bunker, he grabs Wendy's right hand. In the following shot, he is holding her left hand.
Dipper and Mabel were sitting in the middle of the log, but when it zooms out, right before Soos sits down, they're sitting at the far right.
In the previous episode, the Mystery Shack was in renovation, and the "S" should have been put back to its spot before "Headhunters".
After Soos draws the w-neck, the marker he used disappeared from his hand.
While Pacifica is insulting the Pines family, Dipper does not have a putter, but when he decides to make a comeback, he is leaning on a blue putter.
The right wing of the golf cart driven by the royal employee goes through the lamp post as he drives around it.
The golf car has no dents after the employee drove into the lamp post.
When Dipper first hears noise coming from inside the windmill, the wood covering has a design on it. When he approaches with Mabel to tear it off, it is plain.
The map of the course is not an accurate representation. For example, the windmill and the pirate ship are close together, but in the map they are widely separated.
When Dipper is talking with Mabel, his mouth is over his vest.
Dipper's mouth disappears for a frame.
After Mabel throws her club, it disappears. When Pacifica walks towards the Pines, it reappears.
Dipper's club was nowhere to be seen, then he receives it after he told Mabel to grab her club.
When Dipper takes off the panel of the windmill, he's to the left of Mabel. But when it shows them a few frames later, they're swapped.
The lilliputtians that grab the golf ball make the ball appear.
All the other golf balls disappear when the lilliputtians demonstrate how they made the hole work.
When Robbie writes "wieners" on the castle, it was much further down than when the knights entered the episode.
Also, the castle comes down much further than in the beginning of the episode.
The part in Mabel's hair changed from right to left when Pacifica and Sergei entered the mini-golf course.
Big Henry's tool is nowhere to be seen after he takes the golf ball.
When the liliputtians take Pacifica, they are wearing gloves and sleeves, but before and after they aren't wearing them.
When Dipper and Mabel see being Pacifica held captive, Mabel's sticker is on the opposite side of her sweater.
Pacifica's PutPut comes out of no where after Mabel unties her.
After they break out one wing on the golf cart is fine and the other is destroyed, but both sides should be destroyed.
When Mabel is apologizing to Pacifica, in one frame, her braces remain the way they would be when her mouth is wide open, even though her mouth is partly closed.
Gabe's piano disappeared when he was talking to his puppets.
The book that fell on the floor at the library disappeared when Mabel was talking to Gabe.
After Bill tells Dipper he's been keeping an eye on him, Dipper's eyebrows and eyes continuously appear and disappear.
When Gabe visits the Mystery Shack, Mabel's braces disappear when she begins laughing nervously.
When Bill first possesses Dipper, his eyebrows disappear.
When Bill in Dipper's body stopped smacking the drawer onto his arm he had two forks sticking out of it, but when he left they disappeared.
During the show, when Dipper (as a ghost) is doing the kiss scene of puppets Mabel and Gabe, there is a hearth-shaped background close to the socks, but when the camera changes the background is no longer there.
In the theater, Wendy and Bill are sitting in the same seat at first, with exactly one free seat to their right. A few seconds later, they are sitting in two separate seats and there is still a free seat to their right.
Several times throughout the sequence where Bill possesses Dipper, the password bars disappear.
In the attic after Bill possessed Dipper, he was faded like a clone, but his hat wasn't. When Bill as Dipper was outside, all the colors were normal.
The Journal wasn't on stage after Dipper gets his body back.
After Soos leaves work and it cuts to "First Person Puncher," everything is pixelated; the TV, walls, figurines.
During the scene in which Soos is first trying the game and says "I'm learning, and games are making it fun," his eyebrows are misplaced for a fraction of a second.
When dyeing Abuelita's hair, the foil is originally silver, but when she walks away it is bright orange.File:Hair foil goof.png
In the last frame, Abuelita's foil is orange
The "HE's GOT ATTI-CUBE!" poster in the door of Soos' room shows a prominent COOLCUBE logo in the upper right corner when we first see it. In subsequent shots the COOLCUBE logo is missing.
Mabel's cheeks have an unusual outline around them for two frames and flicker back and forth.
When Soos runs into the gaming store, the box he finds Romance Academy 7 in isn't visible.
The note that says destroy at all costs was not on Romance Academy 7's box when Soos first reads it.
The cans of Pitt Cola were not on the floor when Mabel and Dipper entered Soos's room or when they left, but were there when they told Soos that he needs to get to the mall.
During the scene where Mabel and Dipper drag Soos away from his room, Mabel's cheeks have outlines on them for two frames that flicker back and fourth.
When Soos is talking to Melody for the first time, despite the fact that she's in the foreground in one shot, Soos's arm moves over her hair.
In the scene where Soos and the others are hiding behind the toppled arcade cabinet, the character peeking over the fortress wall on the side of the cabinet changes from a peach color to red in one short scene.
In Hoo-Ha Owl's Pizzamatronic Jamboree, the graphics for Star Battle appear on the unit for First-Person Puncher.
When Dipper tricks the badger bear thing into hitting the win button, Mabel's shoes weren't in the shoe holder. Later, when they were caught, Mabel's shoes are back on her feet.
Mabel buys a sticky hand from a vending machine. The containers are all clear with colored lids, but she's shown opening a plastic Easter egg.
While Stan is attempting to get the traveler to come into the Mystery Shack, his mouth overlaps his nose for a frame.
When the Pines first approach the Hand Witch's table, the stall in the background says "Lots O Pots." Later is changes to "Pots Aplenty."
When Stan mocks Dipper's concern about a curse, the stalls in the background change. Instead of Lazy Susan and Old Man McGucket's stalls, Pots Aplenty and Cheep Cheep Tires appear. Additionally, they are transposed (Pots Aplenty was on the right of Cheep Cheep Tires next to the witch's stand).
When Grunkle Stan first grabbed Waddles when he started to tell "Abaconings," the Summerween basket is standing upright. After he put Waddles down on the floor, the Summerween basket is knocked over, and the candy inside it is spilling out.
In the scene in where Mabel and Dipper first see that Waddles is now a genius, the machine that he rolls in on is layered incorrectly with a nearby pile of books.
When Waddles shows Dipper and Mabel the What-the-heck-ahedron, the stack of books was on the opposite side of Waddles, the stuff that fell of the books disappeared, and the What-the-heck-ahedron appeared.
Dipper is floating when Mabel enters the shed, and the ladder isn't there.
The cheapskate's box changed locations.
When Grunkle Stan first throws the grappling hook over the gate, it lands on the ground. When the next shot shows Dipper, Mabel, Stan, and Soos walking up to the front door, the grappling hook is still on the ground, when it should be hooked into the top of the gate, which makes it possible for them to climb.
Lazy Susan's apron stain appears on the right (her left) briefly when her hands are being clasped to the chair. Not long afterwords, when her hands are being unclasped, the stain is again incorrectly depicted on the right.
McGucket had nowhere to hide under the table in Greasy's Diner.
Lazy's Susan purse strap turns from purple to yellow.
When Blind Ivan says, "It is unseen," his tongue makes the motion of an "L".
The first time the photos of "suspicious townsfolk" are shown, Alex's photo isn't there.
The large piece of paper in the middle of the "who is the author?" display disappears the second time the board is shown.
When Mabel is talking to Dipper about Mermando, the picture of Journal 3 the "3" looks like a "5".
The marker Mabel uses to write "Failed" above her summer romances, wasn't in the previous scenes, and is not in any of the following scenes.
During the scene where Dipper tries to deduce who the author is, the photos of suspicious townsfolk vary between having writing on them and not throughout the scene.
When the group confronts McGucket, Dipper shows him the Journal, but when the screen pans in, it shows Wendy's arms holding the Journal. It switches back to Dipper when the screen pans out again.
When Mabel is talking to Wendy about her failed romances, they change positions so that they're near a billboard, but in following and previous scenes, no billboard is visible.
When Dipper views Robbie's memories, the tube isn't in the container.
When Mabel grabs the memory erasing gun, the bottom of the red glass section vanishes
All the members of the Society of the Blind Eye are the same height until they reveal who they are.
During this episode's promo, Blendin Blandin yelled, "My time knee! Oh future dang it!" after he fell, but in the actual episode, he yelled, "My time knee! Oh time dang it!"
When Soos takes the candy from the vending machine, the candy he took out wasn't in the machine. The candy that Dipper and Mabel tried to get was fixed even though Soos didn't grab it.
When Dipper and Mabel look at Soos's drivers license, his wallet disappears.
As a kid, Soos's voice alternates between high and normal.
In the cold open, Mabel's sweater does not have any graphic on it, but is later shown with a doughnut on it.
When Dipper, Mabel, Blendin, and the guards go to the future, Dipper and Mabel are wearing handcuffs, but in the past they weren't.
The mirror reflects Toby as being much closer to it than he actually is. It also does not reflect the railing that is right in front of it.
The photo and signature on Soos' drivers license change drastically between shots.
Before the final challenge of laser tag, the scoreboard shows Blendin with 764 points but after the challenge, his score has changed to 763.
In the final Globnar scene, Mabel and Dipper keep switching places as they talk with the Time Baby about Blendin's fate and their time wish. Dipper is to the left of Mabel in one shot but in the next shot he's to the right of Mabel then back to the left in the next shot.
In several shots, the bandage on Stan's hand is missing.
When Lolph takes out the tablet, there's a crowd behind him. In previous scenes, other people in general weren't visible.
In the future, Lolph doesn't have shoulder pads. In the present, he does.
In Blendin's flashback, when he was carving his mashed potatoes, from a distance the potatoes aren't carved, but up close they look like Dipper and Mabel.
When Dipper and Mabel try to go back to the present, the time machine they only goes to five minutes, but they say they've gone back ten years.
The time machine isn't visible before it was shown broken.
Soos's piano is completely changed between when it was is the hall and his room. Also, he never even brings the present into his room, and neither does Abuelita.
Blendin's spear isn't in the previous or following scenes.
The time baby's mouth is clean a scene after the crowd is cheering for Dipper and Mabel.
When Dipper and Mabel came back to the present, they are a lot dirtier than they were in the future.
The postcard from Soos's dad looks brand new before he makes the time wish.
In the image where Dipper and Mabel are being chased by Blendin on top of a massive clock, Mabel is missing her braces.
The postcard from Soos' dad has no name on it, yet the mailman knows specifically who to give it to.
Right after the cold opening, when the group finds Robbie in the grave, the pine tree on Dipper's hat is missing when the scene is shown from above.
The sponge that Thompson licked wasn't in the previous or following scenes.
Next to the dug grave where Robbie is mourning the break up with Wendy, there is a grave that says 1989-1971, suggesting that the person was born in 1989 but somehow died in 1971.
Stan bandage turns black for a frame.
The folds on Mabel's happiness chart disappears when the giant bird tries to eat Robbie.
In the scene where Stan is sewing a rainbow afro on a stuffed gorilla, the can of Pitt cola is initially miscolored, but is back to its regular color when it gets knocked over.
The bandage on Stan's hand is missing in a couple of shots, but reappears again.
In one shot when Stan is holding his crossbow, the bandage on his hand is colored black.
When Stan grabs his crossbow and aims it at the hot air balloons there are other weapons in his toolbox. But when he talks to Soos, the toolbox is empty.
Robbie's pictures from a little kid to how he is now contradicts with what young Robbie was shown to be like in "Blendin's Game."
The boxes that Wendy and Tambry are sitting on were turned, then strait and then turned again.
In the diner, Robbie's belt appears blue.
When the teenagers are cheering on Dipper for his idea to tape snacks to Thompson, Linda Cardellini says "Well done" but Wendy's mouth doesn't move (nor does Tambry's).
When Tambry sits down in the booth at the diner, she puts her purse on the ground next to her, but in the next frame it is gone. When she is about to leave she picks up her purse, which was on the seat to the left of her.
The mustard on Robbie's jacket sleeve disappeared despite the fact that he didn't lick it all off.
When the Love God first enters the diner, there are a few frames where he has a double chin (as an animation error).
In the scene where Tambry eats the food with the love potion, Tambry's hair is parted to the right instead of the left.
In the scene where Mabel tells Wendy and her friends about Robbie and Tambry, when Mabel first unfolds her happiness chart, Lee's face is not completely drawn for a frame.
When Nate says Tambry's name (after learning about her and Robbie), his mouth is missing for a frame.
The potion that Mabel is originally going to steal is yellow, not black.
After Mabel and Dipper steal the anti-love potion, it still appears in the Love God's belt when he confronts the two, and the potion remains visible in the belt while another anti-love potion is held by Mabel, Dipper, and the Love God.
After Dipper catches the anti-love potion Mabel throws to him, once he gets on stage, it is no longer in his hands.
The mat Charlie and his mother are sitting on disappears when the shot widens to show the Stan balloon looming towards them.
When the Love God gets back the anti-love potion and talks, the anti-love potion looks much bigger than the potions on his belt.
After the group sees that Thompson is being chased by the security guards, they are on a hill overlooking the concert. However, in the next shot after Thompson is being hit with brooms, they are standing in front of stands.
When sitting in the recliner watching TV, there is a pizza box next to Dipper, but in the next shot it's gone, replaced by a can of Pitt Cola.
The appearance of the Northwest Manor is different than when it was seen in "The Golf War".
When Pacifica first says, "I need your help," to Dipper, she is seen wearing sunglasses, but in the next shot, which is at an over-the-shoulder angle showing Dipper, her sunglasses are gone.
When Dipper first answers the door when Pacifica arrives, he is wearing his socks. When he finally agrees to help her, he's wearing his shoes.
When the butler pulls the lever to open the gate, the visible gear mechanism does not turn.
When Mabel first walks into Northwest Manor there is a glue gun stuck to her dress, but in the next shot of her it's gone.
The description of Marius von Fundshauser in the guest list at one point reads "Marius Marius von Fundshauser".
The party's guest list has pictures of four people on each page, and each text box describes the people on each side of it. Marius' box only describes him. and not the woman on the other side of the box.
Grenda has two ponytails for a few frames before she makes the truce with Candy and Mabel.
When objects are flying around Pacifica and Dipper, Dipper is no longer wearing his backpack.
The ghost lumberjack shows up to the original party with a bow tie in his beard, but when he turns back towards the manor, it is gone.
When the ghost laughs and his beard blazes before he tricks Dipper into releasing him from the silver mirror, his mouth overlaps his nose.
Candy drips cheese onto the pastries, but later, when she is talking to Mabel, there is no trail of cheese near the fountain or on the pastries. Also, the pastries' appearance has changed.
When Grenda approaches Marius von Fundshauser to pretend that something is on his shirt, a yellow stain can actually be spotted on his shirt momentarily.
Only a few people are holding glass of apple cider before Preston gives a toast, but after Preston's glass breaks, everyone is holding a glass.
One woman turned to wood while spitting out a drink, which also turns to wood. However, depending on the shot, the wooden drink appears and disappears.
The wooden people change positions several times.
When Dipper is turned into wood, his bow tie isn't tied. Late, when Pacifica looks at him, his bow tie is tied and when he turns back to normal, his bow tie is untied again.
The ghost burns the Northwest family portrait, but when he is looking out the window at the people coming through the gate, the portrait is perfectly intact again.
When the wooden people return to their normal selves, the cider fountain in the background is frozen still.
