Cartman speaks Spanish to the poop-smearing crew.

Butters: (jumps out of his closet in the Professor Chaos uniform) Now you know my terrible secret!
Stan: You're gay? It's fine if you're gay, Butters. I don't care.
Butters: Huh? Nah, I'm Professor Chaos, Stan.
Stan: But we have to teach our parents a lesson, Butters! We're running away! Help me find the perfect place to run away to! (leaves)
Butters: (looks in the mirror) Mm. Umm... maybe I used a little too much silver.

Butters: (reading the newspaper) This lady'll massage your wiener for ninety-five dollars. Well that's a pretty good deal.

Cartman: Okay, Butters, let's start with you. I think I've found a great way to get revenge on your parents. Just... tell me if I'm going in the right direction here. What we're going to do, Butters, is we're going to wait for your parents to leave the house, and then, smear all the walls... with poop.
Butters: Huh. That'll make them awful sore.
Cartman: Now, I want you to take a look at some of these poop swatches...

Butters: I said, I know how you feel. My life has gone completely downhill ever since my future self moved in. I hate him! All he ever wants to do is watch Becker. And that show is so stupid.

Becker is a sitcom that aired on NBC from 1998 - 2004. It starred Ted Danson as the title character.

Butters: Oh, that makes me angry! Why, if Professor Chaos were here he'd make everyone pay!

This is a reference to an episode from earlier in the season, "Professor Chaos."