Deliberate mistake: Bargain Bin: When Homer mistakes the video game boss for his literal boss, he takes out a clipboard so that he can look busy. Aside from being part of the set up for a joke, there is no reason for Homer to have this clipboard on him, nor would there have been anywhere for him to have been hiding it (unless it was just tucked into the back of the trousers).
Continuity mistake: Bargain Bin: Whilst Bart says "This must be the level boss for this part of the game", Maggie can be seen being carried by Marge behind him. Maggie is shown with her hand over Marge's arm, but in the next shot, her hand is suddenly away from Marge's arm.
Continuity mistake: Bargain Bin: In the opening shot of the cutscene, the Simpson driveway is clear, but when the family runs outside in the next shot, a thick oil stain has appeared on the driveway.
Continuity mistake: Bargain Bin: When the mothership flies over the Simpson house, there is a hose tap attached to the front of the house that disappears when the shot cuts.
Continuity mistake: Mob Rules: Apu can be seen in the mob standing behind Snake Jailbird when Quimby announces the Grand Theft Scratchy ban, but when the shot cuts, he is suddenly at the front of the mob and is now standing beside Snake Jailbird.
Continuity mistake: Enter the Cheatrix: When Bart and Lisa arrive in the Game Engine, their arms are extended. When Bart says "Wow", their arms are at their sides.
Continuity mistake: Around the World in 80 Bites: When Moe is congratulating Homer on winning the championship, the two are standing on the edge of a shadowed area. Homer is still next to the shadowed area when Duffman declares him champion, but when the shot cuts, the shadowed area is a few meters ahead of him.
Continuity mistake: Around the World in 80 Bites: When Duffman declares Homer the ultimate eating champion, the Duff cans around his belt all have red labels. When the shot cuts, the labels are now red at the top and bottom and white in the middle.
Deliberate mistake: Game Over: When God has finished explaining how the Simpsons Game manual ended up landing in front of Bart, Homer raises a baseball bat with wings on. While it makes for an amusing moment, this bat was never seen in Homer's hands at any other point in the cutscene, nor was there anywhere for him to put it.
Continuity mistake: Bartman Begins: When Chief Wiggum arrives to arrest Skinner, Lou and Eddie are behind him. Eddie on Wiggum's left and Lou is on Wiggum's right. But a couple of seconds later, when the three walk over to Skinner, Eddie and Lou have swapped places.
Continuity mistake: Game Over: When Lisa has finished building the stairway to heaven, there is a wide shot that shows the stairway complete in its entirety. When the shot cuts to Lisa, she has suddenly appeared at the bottom of the staircase.
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: Mob Rules: Just after Quimby announces the Grand Theft Scratchy ban, Groundskeeper Willie and Lenny swap places between shots.
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.
