Gonzo and Rizzo said that MFS was based on real events (like TMM) but Dave Golez has said that Gonzo being an alien is just a movie. I think that things like MFS are "real" until the Henson Company dedcides that it is easier to have them not be. Also, cannon can be difficult to decide, for instance, what is MFC? It is supposed to be real, there are nods from the audience, but the Muppet babies appear. One last thing, TMS is cannon. the fact it takes placec in a theater only means it's in the muppet universe. I mean we already know that Kermit's birth would have eliminated some reality shows.