Merry Christmas Charlie Manson! - S2-E16
Other mistake: When kids go to Nebraska to see Mr Hankey, some kids in the crowd are Butters and Craig and others usual school friends, despite being hundreds of miles from South Park.
Starring: Trey Parker, Isaac Hayes, Matt Stone, Mona Marshall
Merry Christmas Charlie Manson! - S2-E16
Other mistake: When kids go to Nebraska to see Mr Hankey, some kids in the crowd are Butters and Craig and others usual school friends, despite being hundreds of miles from South Park.

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)
Scott: All of these things link Terrance to the murder: hair fibers, blood samples, nail clippings, a piece of his shirt, a watch with his initials on it, a day planner with the murder scheduled, a haiku called "Time to Kill Dr. Jeffrey O'Dwyer": Dr. O'Dwyer, time to have your head smashed in with my new hammer. Terrance, you may be a famous surgeon, but you're not God. J'accuse Terrance.
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