User blog comment:Mystery Dipper/Theory New Episode/@comment-27159736-20150525194630

It does look like a flashback episode given the authors younger appearance, given the credits scene in Not What He Seems it also proves the flashback episode.

it looks like we may get some info on either the portal or the Bill Cipher Wheel given the amount of question marks (however more likely to be for the portal since the overall layout of the diagrom of question marks match the shape of the portal rather than the wheel given that the wheel has ten symbols while the chalk board has only eight to nine question marks