The Tooth Fairy's TATS 2000 - S4-E1
Other mistake: Cartman is excited because the "tooth fairy" left him two dollars in exchange for a tooth. When he holds up the two bills, they are identical. Both have the same serial number.
Starring: Trey Parker, Isaac Hayes, Matt Stone, Mona Marshall
The Tooth Fairy's TATS 2000 - S4-E1
Other mistake: Cartman is excited because the "tooth fairy" left him two dollars in exchange for a tooth. When he holds up the two bills, they are identical. Both have the same serial number.

Cartman Gets an Anal Probe - S1-E2
Continuity mistake: In the classroom there is a poster of The Laughing Cavalier in the back wall in the class. In the last shot of that scene you can notice that the poster has disappeared and is replaced with an astronaut poster. (00:09:05)
Kyle: Cartman, you have such a fat ass, that when you walk down the street people go, "God, dammit thats a big fat ass!'
Cartman: They do not!
Random guy: God Dammit, thats a big fat ass!
Trivia: Dr. Mephisto is based on Marlon Brando in The Island of Dr. Moreau (1996).
Question: I have never been to Scottsdale. Why do the Goth kids consider it to be a miserable place?
Answer: Scottsdale is a well-liked destination for fun; resorts and spas, outdoor activities like hiking and rock climbing, golfing, cultural events, and a bouncy nightlife. It's generally considered an upbeat and convivial place, exactly the sort of environment the gloomy Goth kids would consider to be awful.
Purple_Girl