Continuity mistake: In the opening scene, the trees in the background keep moving between shots.
Continuity mistake: When Wendy asks the crowd where they all are going, the wide shot shows that Kyle is nowhere near the stage. When it cuts Kyle is standing right next to Wendy.
Continuity mistake: Tom's Rhynoplasty appears between two different sets of buildings in the street shots.
Cartman's Mom is a Dirty Slut (1) - S1-E14
Continuity mistake: At first the football team is mentioned as "The 1989 Denver Broncos" but throughout this episode and its sequel, they are "The 1991 Denver Broncos."
Mr. Hankey, the Christmas Poo - S1-E10
Continuity mistake: When the town are protesting outside the Mayor's office, the woman at the front of the Nativity protesting group is wearing a purple shirt. A few seconds later, she is with the group against the cutting-down of Christmas trees wearing a completely different shirt (white with a Christmas tree in a red circle with a line through it).
An Elephant Makes Love to a Pig - S1-E6
Continuity mistake: In the end classroom scene, whenever they show Kyle, he is in front of the class, but in the wide shots, he is behind other kids.
Continuity mistake: In the cemetery scene where Kyle calls the emergency hotline and Stan and Cartman hold off the zombies, in the shot where Kyle's hand holding the Worcestershire Sauce is shown in close-up, his gloves are shown as green instead of white, which they are while Kyle is in his vampire costume.
Continuity mistake: During the scene where Chef goes to see the Mayor and Officer Barbrady, there is a shot from outside, where a pumpkin is visible in the window. But when Chef goes inside, there is no pumpkin.
Continuity mistake: The birthday cake disappears in some shots after they give it to Stan's grandfather.
Continuity mistake: When Mr. Garrison asks Officer Barbrady where he can get the best shot or view of Kathy Lee. Barbrady's pants are black. In the next scene when Barbrady takes the next guy's camera his pants are blue.
Cartman's Mom is a Dirty Slut (1) - S1-E14
Continuity mistake: The video sent in by Stans granddad of Kenny getting hit by the train doesn't match what actually happened.
Continuity mistake: When Kyle cuts Kenny in half, we see a skull behind him, but in the other scenes, the skull is to his right.
An Elephant Makes Love to a Pig - S1-E6
Continuity mistake: Kyle has a black eye, but it has magically disappeared by the time he gets home.
Big Gay Al's Big Gay Boat Ride - S1-E5
Continuity mistake: When the boys are playing football, as the shots change, if you look behind the bleachers, sometimes there are mountains and other times there is nothing but sky.
Continuity mistake: After Warsog gives his "statement" to the townspeople, he removes his glasses when telling them to direct their complaints to a nearby wall. Then, as he walks back inside, his glasses are back on his head. (00:15:05)
Continuity mistake: At the end when the airplane hits Kenny, there is a gravestone with a cross on it behind him, but all the time when the other three boys were talking, none of the gravestones behind them had crosses.
Continuity mistake: While Kyle is asleep in his bedroom the Triangle of Zinthar is on the dresser beside the framed photo, but in the next shot when the cut ceiling falls onto the floor the Triangle has vanished, then it reappears on the dresser where it is supposed to be. (00:07:40)
Continuity mistake: During the rehearsal of the play, Kenny's Indian feather is blue. When the tepee crushes him, his feather is now yellow.
An Elephant Makes Love to a Pig - S1-E6
Continuity mistake: Shelly throws Stan on the carpet, but then in the closeup, something blue appears under him. (Despite a deleted scene, this is still a mistake within the show.)
Cartman Gets an Anal Probe - S1-E2
Continuity mistake: The "School Food Is Good Food" poster in the cafeteria changes fonts between shots. (00:10:50)
Answer: He appears in at least 5 other episodes, but usually just as a background character. He can be seen at Cartman's party in "Immaginationland". He was also one of the kids trying out to replace Butters in the "Professor Chaos" episode.
Bishop73