Continuity mistake: Towards the end of the movie during the play, Kelly goes backstage during intermission, and her hairstyle and color has changed. (According to DVD commentary, it was a pick-up scene and she had already started filming Spider-Man. That's why her hair was now red. Still a mistake, but there's the explanation.)
Dr. Desmond Forest Oates: I'd like you to read this poster and tell me what it says at the bottom.
Kelly: "No food or drink allowed in the auditorium at any time."
Dr. Desmond Forest Oates: It says "Twelve original songs by Dr. Desmond Forest Oates."
Kelly: Oh, that part.
Dr. Desmond Forest Oates: Yes, that part. I'll tell you what it doesn't say. It doesn't say "Additional lyrics by little miss sassy pants."