South Park: Bigger, Longer & Uncut (1999)

Other mistake: When the switch is thrown to electrocute Terrence and Phillip, it's pulled downwards. A few shots later, we see Cartman jump in to save T and P by turning the switch off. He also pulls the switch downwards instead of pushing it upwards. (01:06:05)

Cartman: Don't call me fat, you fucking Jew!
[Gasp from the class.]
Mr. Garrison: Eric! Did you just say the "F" word?
Cartman: [confused.] Jew?
Kyle: No, not Jew! He's talking about "fuck"! You can't say "fuck" in school, you fucking fat ass!
Mr. Garrison: Kyle!
Cartman: Why the fuck not?
Mr. Garrison: Eric!
Stan: Dude, you just said "fuck" again!
Mr. Garrison: Stanley!
Kenny: [Muffled.] Fuck.
Mr. Garrison: Kenny!
Cartman: What's the big deal? It doesn't hurt anybody. Fuck fuckety fuck fuck fuck.
Mr. Garrison: How would you like to go see the school counselor?
Cartman: How would you like to suck my balls?
[Gasp from the class.]
Mr. Garrison: What did you say?
Cartman: I'm sorry. I'm sorry. Actually, what I said was...
[Cartman pulls out a bullhorn.]
Cartman: HOW WOULD YOU LIKE TO SUCK MY BALLS? MR. Garrison.
Stan: Holy shit, dude.

Trivia: This cracks me up every time I see it. If you think Satan is really cut have a close look at his abs. They are in the shape of a big penis. (00:27:55)