I spent some time looking at the newest Shorts episode Tooth, and noticed something. The picture that flashes at the start of the episode is half a circle with a line through it, similar to Bill Cipher's eye. A line drawn through it looks much like a portion of a cross.
So, and I apologise if this is really really stupid, but after piecing the papers together, I found that they resembled an eye with a cross through it, the symbol of the Royal Order of the Holy Mackerel. So I'm guessing that the Order will have a large part to play in the next season?
Also, I couldn't quite hear what the giant talking floating island head thing said when it chased Dipper and co. Is it possible that it said something that's only clear in reverse? And if so, could someone please rewind it?
I apologise if all of this is already obvious or just ridiculously stupid, I've really only now started to pick up on the subtle aspects of the show, and as a result feel a compulsive need to go rant about it to people.