Revealing: Right after Wendy tries to convince the crowd that Cartman's actual paper was 'Walden' with Cartman's name on it, Stan mentions something about Kyle's mom making tuna fish sandwiches. When he does this, you can kind of see him 'lift' off the background.

Continuity: When Mr. Garrison is carrying around his gun, it is not the wood finished gun with the wood colored hand grip that he bought, it was the other one that had the grey hand grip.

Factual error: When Cartman eats the "Weight Gain 4000," he not only gets fatter, but taller as well.

Continuity: 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: When the boys are standing in a group, Kenny disappears after a while, then Stan disappears, but then a second later, they are all back together.

Continuity: 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: Kyle has a black eye, but it has magically disappeared by the time he gets home.

Continuity: 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.)

Continuity: Just before Warsog emerges from the network building for the first time, Mrs. Marsh is shown to be stood next to a couple of random townspeople. In the very next shot Mrs. Cartman, Mrs. Broflovski and a third nondescript have appeared.

Continuity: 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.

Continuity: The birthday cake disappears in some shots after they give it to Stan's grandfather.

Other: Both Kyle's and Stan's mothers are identified in this episode as Carol. They later become Sheila and Sharon.

Continuity: When we see Kenny from the front, the hole in his head exposing his brain appears on his left side, but when we see the top of his head when he is biting people, the hole is in the back of his head.

Continuity: When Kyle cuts Kenny in half, we see a skull behind him, but in the other scenes, the skull is to his right.

Continuity: 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: 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: Tom's Rhynoplasty appears between two different sets of buildings in the street shots.

Continuity: In the opening scene, the trees in the background keep moving between shots.

Continuity: 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.

Revealing: When Cartman walks in on Sally Struthers eating the cake, the cake has holes in it, and part of her hair goes in front, and part of it is visible through the cake. All of the other slices have holes in the same place as well.