Audio problem: The judge's mouth doesn't move when he says, "Must be an original piece" about Buffy's dramatic reading at the pageant.
Audio problem: When Brenda is in the movie theater, people are hurting her and yelling at her, but no one's mouth moves. (00:56:30)
Audio problem: In the scene in the teacher's classroom, when the teacher says "I'll see you after class". Two guys say "Sweet" and "Alright" and high five each other. However, their mouths don't move at all. (00:23:10)
Chosen answer: I know for sure they were making fun of the movie 'Usual Suspects' (dropping the cup) - they might have added the gag of the fish in it to appear as though she was shocked by the fish instead of the true identity of Doofy.