Continuity mistake: Game Over: When Marge says all they can do is pray that God saves us, Lisa (who is standing in front of Marge, but turned away), turns her body around 90°, and then turns her head to the right 90° so she is looking at Marge. When the shot cuts to Lisa, she is facing Marge directly.
Character mistake: Game Over: After returning from the Game Engine and Bart points out they are still under attack, Marge says "I guess all that's left to do is pray that God saves us." When she says this, Lisa can be seen smiling, but the town is still under alien invasion so there should be no reason to do so. She doesn't come up with the idea to use her Buddha Hand powers to talk to God until right after Marge says the line, so it couldn't have had anything to do with that.
Other mistake: Game Over: Once everyone returns from the Game Engine, Homer sits down on the couch. The house then rumbles, prompting Bart to walk over to the window and say "Homer, we're still under attack." When Bart says this, he looks over to the left side of the living room. But the window is in the centre of the room and the couch directly faces the window, so there is no way Bart could've been looking at the couch to say the line to Homer.
Continuity mistake: Game Over: When Bart points to the doors to get back to Springfield, we can see that there is a red carpet leading up to the doors. In the next shot, the red carpet is much narrower.
Continuity mistake: Game Over: When everyone is escaping the Game Engine, Mr Sparkle can be seen exiting the Big Super Happy Fun Game level. In one shot, he is a couple feet off the ground. But in the next shot, he is several meters in the air.
Other mistake: Game Over: Whilst the Game Engine is collapsing, there is a shot of the video game characters escaping their respective games, shown from on the ground, while the Simpsons toward the door back to Springfield. To the right, a character can be seen exiting the Big Super Happy Fun Game level, but the door behind him is closed.
Revealing mistake: Bartman Begins: When Bart is walking through the alleyway, complaining he only has the games he bought yesterday, he steps on top of a discarded wrapper, but wrapper is unaffected by getting stepped on by Bart's foot. It remains in the same position and is never shown bending.
Revealing mistake: Mob Rules: When Lisa is asking Marge if she finds it hypocritical that she is opposed violence in games, yet she used violence to get her way, the body movements used for the mob appear to be repeated and reused throughout the shot. Every time they are shown waving their arms, they appear to move in the exact same way.
Other mistake: Mob Rules: When Quimby, the game producer and the two interns get out of the hot tub, no water can be seen dripping off their bodies and onto the floor.
Character mistake: Mob Rules: Marge is reading a newspaper regarding senators trying to push Mayor Quimby to ban Grand Theft Scratchy. She looks at the bottom of the page and discovers Quimby is cosying up to a sleazy video game producer; she disapproves of this, but she appears to be smiling when saying "That really burns my beehive" despite there being no reason for her to do so.
Revealing mistake: Invasion of the Yokel Snatchers: An alien takes the coupons that Cletus is holding. After looking at them, the alien throws each of the coupons to the ground, one by one. The same animation is reused for each of the coupons falling, as shown by the fact that all of them appear to fall to the ground in the exact same fashion.
Factual error: Lisa the Tree Hugger: After saving Lenny and Carl, Bart aims his slingshot at the target controlling the factory and fires a stone from the slingshot, hitting the target. Once the stone hits the target, debris from the impact can be seen flying off the target showing that it has been destroyed, but as the dust clears, the target is virtually intact.
Continuity mistake: Big Super Happy Fun Fun Game: After Milhouse emerges from the water, Lisa says to him, "Knock it off Milhouse, we know it's you" and she has her right hand raised pointing at him. When the shot cuts, her hands are at her side.
Continuity mistake: Lisa the Tree Hugger: In the opening shot from the first cutscene in this level, there is dirt at the bottom of the door to the Auntie Nature logging company. The door is there throughout the opening cutscene, but there is no sign of the mud at the bottom of the door in any other shot.
Continuity mistake: Around the World in 80 Bites: After Homer has been declared the winner, a pair of massive dentures are unveiled and the winner of the previous race gives Homer the belt. When Homer is attempting to put the belt on him, there is a small distance between him and the dentures. In the next shot, Homer has suddenly moved closer to the dentures.
Continuity mistake: Mob Rules: When Ned says Grand Theft Scratchy is going to turn kids into Stabby Sam's and Drive-by Denny's, Lisa is standing straight facing Ned and Marge is standing 90° to the right. The shot cuts and suddenly Lisa is standing 90° to the left facing Marge and Marge is standing straight forwards facing Ned.
Continuity mistake: Mob Rules: When Mayor Quimby and the games producer notice the mob of parents outside the building, Marge is standing near the front of the mob and a senator is standing next to her. When the shot cuts to focus on the senator, Marge is no longer standing next to the senator and has been replaced by Snake Jailbird.
Continuity mistake: Enter the Cheatrix: When Professor Frink shows Bart and Lisa the strategy guide, Frink's left hand is holding onto one side of it. Two of his fingers are located next to Krusty and his little finger is partially obscuring Nelson. The shot cuts to a closer shot and his fingers are suddenly further away from both the image of Krusty and Nelson.
Other mistake: Shadow of the Colossal Donut: Homer and Bart run past Kent Brockman in an attempt to go after Lard Lad. After running past Brockman, they turn onto the street on their left. Brockman goes after them, but instead of turning left, instead runs straight forward, but somehow still interviews Homer and Bart whilst running down the street anyway.
Continuity mistake: Enter the Cheatrix: After Bart and Lisa have saved Professor Frink, Frink hands the strategy guide to Bart. Professor Frink activates the Rift Portal and Bart and Lisa walk over to it. At this moment, the strategy guide has vanished from Bart's hand. The guide reappears once Bart and Lisa have gotten in the Rift Portal.
