I have had this idea for a while but the most recent trailer adds more evidence. I think that it would pretty interesting if everything that Dipper and Mabel encountered that was sort of left hanging, could come back and help stop Bill. In Escape from Reality we already see a manatour and the Multibear, as well as Celestebelle and some Gnomes. In the trailer I saw Rumble McScirmish and someone from Sev'ral Timez. Alex Hirsch has said at one point that:"Quentin Trembley will return when his country needs him most" and whose to say that Dippers 3&4 won't come back. Maybe even some artifacts like the flashlight could return. Do you think this could happen, or am I reading too much into things?