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.
Continuity mistake: Big Super Happy Fun Fun Game: The giant toilet in the village has an additional section added onto the right-hand side of it, which has three coin slots and is used to insert the Sparklemon into. When Mr Sparkle goes to clean up the village, this additional section has disappeared from the toilet.
Continuity mistake: Big Super Happy Fun Game: In the opening shot of the end cutscene, the coin slots on the giant toilet are shown with the middle slot ahead of the other two. When Homer and Lisa go to insert the Sparklemon into the slots, the three slots are more in line with each other and stay that way for the rest of the scene.
Continuity mistake: Big Super Happy Fun Game: When Homer and Lisa first approach the giant toilet and Mr Sparkle appears, Lisa is standing so that her hair is positioned behind Homer's left arm. When the shot cuts, her hair is positioned in front of Homer's arm.
Continuity mistake: Invasion of the Yokel Snatchers: When the alien starts taking a whiz in the fountain, cracks can be seen on the mall behind it. The cracks appear to start from the ground, going up the building by a few feet. In the next shot, those cracks have disappeared.
Continuity mistake: Invasion of the Yokel Snatchers: When the security guard confronts the alien taking a whiz in the fountain, that one alien appears to be the only alien in sight. When the shot cuts back to Homer and Bart, two extra aliens have suddenly appeared.
Continuity mistake: Invasion of the Yokel Snatchers: When the water fountain is first shown, there are two rows of sprinklers shown around the fountain spraying water. One row of sprinklers around the edge of the fountain and a second row along the interior. When the shot cuts, the row of sprinklers around the edge of the fountain are no longer spraying water, leaving only the interior row spraying water.
Continuity mistake: Game Over: After everyone escapes the Game Engine, it cuts to an exterior shot of the Simpson house. In the shot, a red mat can be seen outside the front door. Later, when Lisa goes outside, the mat is now green. There is also a tap attached to the house shown in the establishing shot that disappears when Lisa goes outside.
