Other mistake: Game Over: When Lisa has finished building the stairway to heaven, there is a shot shown from behind the large crowd of people that pulls back to reveal the stairway of Springfield buildings. In the shot, everyone in the large crowd appears to be looking at the stairway, but Private Burns appears to be looking off to the right and not at the large stairway.
Continuity mistake: Game Over: When everyone begins running through the door back to Springfield, a few extra pieces of rubble suddenly appear next to the door when the shot cuts.
Continuity mistake: Big Super Happy Fun Game: When Homer tells Milhouse to beat it, he raises his right fist and leaves his left arm at his side, but when the shot cuts, his left fist is also raised.
Continuity mistake: Five Characters In Search Of An Author: When Matt Groening is watching Homer and Bart through the security camera footage, his hands are clasped. When the shot cuts, his hands are apart.
Continuity mistake: Medal of Homer: When Bart asks what war they are in, Homer replies saying it's the Civil War, and he raises his right hand. When the shot cuts, his right hand is lowered.
Continuity mistake: Enter the Cheatrix: When the Rift Portal appears after Frink gives Bart and Lisa the strategy guide, in the shot of them getting inside the portal, a piece of paper with some test results can be seen sticking out of the side of the portal. In the next shot, the results shown on the paper have suddenly vanished, leaving the paper blank.
Continuity mistake: Enter the Cheatrix: When Professor Frink climbs down the ladder to talk with Bart and Lisa after he is saved by them, they stand next to a large machine that Frink uses to bring a Rift Portal to them. At the start of the cutscene, the arrow on the right-hand side of the machine is pointed to the left. When the Rift Portal appears, the arrow is pointed to the middle.
Continuity mistake: Enter the Cheatrix: Whilst Bart and Lisa are talking Professor Frink after arriving in the Game Engine, there is a large green pipe that is positioned behind Bart and Lisa during the conversation. Later in the cutscene, when Frink is grabbed and taken away by the giant ape, the green pipe is now a few meters ahead of them.
Continuity mistake: Enter the Cheatrix: When Lisa knocks on Professor Frink's door, the box of band candy that Bart is holding has no text on the right side of it. Bart then raises the box saying "I gotta move this candy" and the words BAND CANDY have suddenly appeared on the side of it.
Continuity mistake: Enter the Cheatrix: When Bart and Lisa approach Professor Frink's front door, in the wide shot, Bart and Lisa step on the front step and Bart is shown standing on the left hand side of the step and Lisa is standing on the right hand side. When the shot cuts to a closer angle of the two, Lisa is standing more to the middle.
Other mistake: Lisa the Tree Hugger: When the factory explodes, Lisa is standing outside the entrance looking at a damaged sign break off the wall. Everything that Bart and Lisa did to destroy the factory occurred within the confines of the company, so there is no reason that the sign should be tattered or broken off.
Continuity mistake: Lisa the Tree Hugger: When the cutscene opens on Bart and Lisa standing outside the logging company, the establishing shot shows them with their backs to the main door. When the shot cuts, they have rotated 90° so that the main door is positioned to their left.
Character mistake: Invasion of the Yokel Snatchers: When Homer and Bart witness Cletus getting abducted, Bart tells Homer "they're torturing that yokel", almost as if Bart doesn't know who he is. The Simpson family has interacted enough times with him throughout the series to know who he is and that his name is Cletus.
Continuity mistake: Mob Rules: When the mob begin cheering after Quimby bans Grand Theft Scratchy, they are standing on the curb. When the shot cuts, the mob is now standing on the road and Marge and Lisa are the only ones standing on the curb.
Revealing mistake: Mob Rules: After part of Town Hall collapses, the shot cuts to Marge and Lisa. Lisa can be seen holding a lit torch, but for the first frame of the shot, the fire doesn't appear to have been animated onto the torch. The fire just pops up on-screen a few frames after the shot starts.
Continuity mistake: Mob Rules: When the Scratchy statue is knocked down, the head rolls away and crashes into Town Hall causing part of the building to collapse. Two window frames can be seen falling beneath the rubble. When the shot cuts, the window frames are suddenly above the rubble.
Continuity mistake: Bargain Bin: When the mothership flies away from the Simpson house, the family are shown standing next to a small wall. In the next shot, they are standing a few meters ahead of it.
Continuity mistake: Bargain Bin: When the family are in the living room looking at the Video Game FAQs, a drawer can be seen on both sides of the couch. Both of these drawers have a shelf below it, with three books shown each of the small shelves. A couple seconds later, when the Simpsons get transported to the Game Engine, the books have disappeared from the shelf closest to the window.
Continuity mistake: Big Super Happy Fun Fun Game: When Milhouse loses his powers and hands Homer and Lisa the keycard, the amount of rocks on the ground change between shots. At first, there are two rocks behind him to his left, but when the shot cuts, there is only one rock behind him to his right.
Continuity mistake: Big Super Happy Fun Fun Game: When Milhouse finishes shrinking back down to human form, the keycard suddenly appears in his hands when the shot cuts.
