In this episode, the Bijou Theater is showing the movie, "Grossout Comedy 8."

Receptionist: Sure. If I could get a description of the child to print underneath the photo? (stops and turns around)
Cartman: Oh, yes. Uh-huh. He has ah, blond hair, a- and, ah, and a brown eye. (laughs) Brown eye! (laughs again)
Receptionist: Okay, brown eye...
Cartman: And, and big rosy cheeks! (laughs)
Receptionist: Full cheeks...
Cartman: (laughs hard) Full cheeks! Winking brown eye, brown eye winking! (laughs)

Jimmy: Okay. Try this one on for size: Why did the... pigeon cross the road?
Cartman: Okay, why?
Jimmy: Because it was having sex with the chihi... Because it was having sex with the ch-hi-hi... Because it was having sex with the ch-ch-ch-ch-ch-ch-ch... eh, it was having sex with the ch-ch-hicken. (Cartman doesn't laugh)
Cartman: No, see? Something's wrong. I'm not laughing.

When we first see Ben Affleck, he has a green shirt on - but a few seconds later, he's wearing a white shirt.

Mrs. Garthunk: I think it will amaze you as it will all of us to learn that your son... is Ben Affleck!

Ben Affleck is an actor and writer who won an academy award for Best Original Screenplay for Good Will Hunting. Affleck being the son of the butt-faced people is a reference to his chin-dimple, which is vaguely butt-shaped.