Continuity mistake: When Kenny dies, his heart explodes, leaving blood and guts all over the boys and the wall behind them. When the boy's mothers enter the room moments later, the boys, and the room, are spotless. (00:19:20)
Continuity mistake: When the kids walk away from the movie theater, and they start to sing "Uncle F----," Stan moves to the back of the line, then in the next shot, he's in the front. (00:07:15)
Continuity mistake: Towards the end of the "Kyle's Mom" song - when his mother actually appears on screen - the position of her arms change between shots. In some shots, her arm are flat against herself, in others, she has her hands on her hips and her arms arched, etc. (00:30:55)
Continuity mistake: As Saddam starts his "I can change" song, his suitcase disappears from Satan's bed. [If you look closely at the second picture, you can see the top of the suitcase, behind the striped bedcovers. It hasn't disappeared, but has moved (which is still a mistake)] (00:52:30)
Continuity mistake: When we first see the boys in the movies, Stan has a green drink in his left hand. Then in a closeup the drink isn't there, then in the following wide shot, it's back again. (00:04:45)
Continuity mistake: During the USO Show, Terrence is sitting in the left electric chair, and Phillip is sitting in the right electric chair. Just before they get electrocuted, they swap places, and then quickly swap back. (01:01:10)
Continuity mistake: When we see the outside of Kyle's house, the doorknob is on the right of the door. When we see the inside of the house, the doorknob is still on the right. Do the Broflovskis have a magic door? (00:02:50)
Continuity mistake: When Kyle is searching for 'clitoris' on the computer, the mouse and mousemat next to the keyboard disappears and reappears continually. (00:37:55 - 00:39:00)
Continuity mistake: When Shelia is singing inside the house, she is looking out the window and there are no curtains, yet in the next shot indoors there are curtains hanging in the window. (00:02:55)
Continuity mistake: When Kenny is brought into the hospital, there is a schedule on the wall next to the door (Dr. No is scheduled to 'Kill Bond'). When Kyle is worried that their Mums will find out that they went to the movie, the Doctor column has vanished from the chart. A little later, the columns are reversed. (00:17:47)
Continuity mistake: The stage and the MAC group (Kyle's mom's group) is next to Tom's Rhinoplasty, but it keeps appearing and disappearing during the "What Would Brian Boytano Do" song. (00:36:10)
Continuity mistake: The letters on Chef's apron change place and size between shots. (00:11:58)
Trivia: Take a look at the flags at the UN Building - Between the flags of Turkey and Brazil is the Jolly Roger. (00:25:20)
Continuity mistake: In the "La Resistance" scene, the kids change places between the shots. They quite obviously don't have time, such as one change between a normal shot and a top shot. (00:48:15)
Continuity mistake: Before going to the cafeteria, Kyle and Stan have two different t-shirts but when they are waiting in line, Stan wears the same t-shirt than Kyle. His t-shirt is different again when they talk to Chef. (00:11:20)
Continuity mistake: On the Conan O'Brien show, Phillip farts in Terrance's face and Terrance lands in a drum. Terrance's moustache falls off and lands on the stage, yet in the next shot it's gone. (00:23:15)
Continuity mistake: When the five boys are walking to the movies, between shots Ike goes from being behind, to in front, then back to behind the others. (00:03:35)
Audio problem: At the end of the film, When all the people from South Park are singing: "Mountain Town Reprise", If you look closely while the camera pans away from them... For a split-frame, Stan's mouth disappears then reappears.
Chosen answer: They don't believe him, so they're making a sappy joke about him "still being here all around us."
Captain Defenestrator