Here are explanations for my Waiting for Guffman clues. Sorry if they proved to be too difficult. I think I probably know this movie better than most, so many of the clues seemed easier to me than they probably should have.
Big dreams: The main plot involves the cast dreaming about moving their play to Broadway.
Visitors: The play includes interviews and a musical number about Aliens visiting their town. “At one time or another these different ones of 'em came in, four or five or six of 'em at different times, and all of 'em probed me, uh, not all at once, you know, individually.”
Medical procedure: A funny dinner scene in which Fred Willard’s character describes his penis reduction surgery. “It was a minor procedure.” “Not very minor any more.”
Bubble bath: Corky St Claire contemplates life and his directing future in a bath tub after being denied the budget he needs to finish his play.
Model: A model town is used by the town council to determine where the trashcans need to be placed and whether they should station snipers on the corners of the roofs of buildings for protection.
Quick History: The history of Blaine, MO is summarized in the play.
California: The first scene of the musical concerns the founders’ attempted journey to California, mistakenly ending up in Missouri instead.
Stools: The “famous” Stool Boom of Blaine is recreated in the play.
Red, White, and ______: Red, White and Blaine" is the name of the play that Corky directs.
Broadway: Corky tells the cast of this horrible abomination that they may be going to Broadway because of a famous producer is coming to see the show.
Sesquicentennial: The play is the highlight of the town’s 150 year anniversary of its founding.
The lead actor’s gear went to 11 in a previous role: This is an obvious allusion to Christopher Quest whose amp in This is Spinal Tap was louder because it went to 11.