Question: Near the end, when Dean Wormer and Mayor DePasto are in the grandstand, officially launching the parade, there is an elderly gentleman in the background (also in the grandstand, about 2 levels up, on the left side of the screen) who is making odd, excited gestures and comical facial expressions. His appearance and odd mannerisms are so striking that he draws my attention away from the dean and the mayor every time that I've seen this film, and that's a lot of times. Surely, director John Landis must have been aware of the gentleman and his antics in the background through multiple takes, so it would seem Landis intended the peculiar distraction. Who was that gentleman, and was there any significance to his appearing in the scene?
Question: Kent Dorfman is a member of Delta fraternity, so why, later in the movie, is he seen in a military uniform with the Omega fraternity?
Answer: He's in R.O.T.C. The Omegas are in the class, too. Military uniforms are required dress.
Question: Why didn't the mayor try and have the Deltas arrested for both the mayhem they caused at the parade and that one of them may have had fun with his underaged daughter? Obviously the audience knows the member didn't but the mayor doesn't.
Answer: There's no indication that the Deltas didn't face legal ramifications from their actions at the parade, nor that Pinto didn't get in trouble (when we last see him, he's literally being chased by the mayor). The film ends at that point and, although the film provides title cards telling us what happened to the characters far in the future, we don't see the immediate aftermath.
Question: What is the musical song called that's played during Otter and Mrs. Wormer's affair in Otter's bedroom?
Answer: It's Bossa Nova music that has no title. It was incidental music composed by Elmer Bernstein for the film.
It's the theme from A Summer place.
The theme from "A Summer Place" is playing when Mrs. Wormer comes into the house. But it's not what is playing when they get into the room.
Question: What happened to Flounder's girl Sissy? Flounder never mentions her after he brings her to the toga party.
Answer: Nothing "happens" to her, she just isn't in the movie anymore. She's only in a single sequence and is completely inconsequential to the plot, so there's no need for to the film to address her or her movements after the party. Flounder has no reason to mention her.
Answer: Sometimes these things get left in because it's simply the best take. (The child covering his ears before the gunshot in "North by Northwest," for example.) It could also be that John Landis cast the extra because he wanted someone with goofy expressions in the crowd. He simply could have told the extras "Ok, be excited that you're at a parade," and that's how this extra did it.
Captain Defenestrator