Factual error: Although the movie supposedly takes place in Blaine, Missouri, you can see Texas flags in certain shots. The movie was filmed in Texas.
Great sites
Waiting for Guffman mistakes
Continuity: Although Corky's apartment is up a long flight of stairs (we see this in all of the establishing shots, as well as the scene where the cast comes to beg him to return to the show), during the scene where he is "wrasslin'" with "the Muse of Dance," the view out the windows is decidedly street-level.