Lighting turds on fire comes from "Billy Madison."
(Gosh, I'm surprised anyone thought that I thought that "Billy Madison" was the first place anyone had ever thought of lighting a turd on fire. It's just a reference someone sent in, not a point of origin, people)
Major mistake: There's a window next to Cartman's door that can't be there, as there's a hallway passing by his room.
"Is this Mr. Thompson with Anatomy Research?" — is this a reference to the strange anatomy Stephen Thompson had on his head in "How To Eat With Your Butt"?
Chef sounded different this time becasse he dropped by the studios to record his lines rather then send them from New York.
The flag is displayed the wrong way when Cartman speaks before Congress. The blue field should have been at upper left. This is the way to display flags, whether they be displayed horizontally or vertically.
Room numbe on Kenny's door: 648
Name next to the door: K. McKormick
Well, Cartman sold only one of the thirty-three fetuses he had. He destroyed another one in a fit of anger and got the stem cells from the other thirty-one fetuses to replicate the Shakey's next door. Anyone can then order pizza on demand by asking for one, and the stem cells would be put to work to replicate the pizza, so pizza can be had for free. But the reality is that pizza is not the only expense at the new Shakey's. There's labor, utilities, rent, taxes, and so on.
"I love Kenny McCormick and... [sob] I want you to love him too." — this refers to a similar line, "I love Brian Piccolo....and I want you all to love him too," from the movie Brian's Song (1971).