Sorority Girl: It's about to get sticky in here. (Joel reins in Crow and Servo before they can say anything)
Moffit: Still sore from last night? (talking about standing his girlfriend up; Servo coughs loudly)
Girl, to friends: I was never so bored in my life. Joel: Did you touch it?
Running Gag: How the people on campus look older than college-aged, which Joel and the bots take to ridiculous extremes, painting them more as senior citizens.
Saying something about a tuffet every time Mr. Moffitt's name is said.
Satan: Riffed twice in the film: First, Joel pretends a snake is Satan ("This is what happens when you have sex before marriage."), and at the end, that the cat is Satan ("I'm Satan. I did it, and I'm proud!").
Shout-Out: During the autopsy scene, a close-up of a skeleton leads to this riff: