Other mistake: Big Super Happy Fun Fun Game: When Homer is crossing the bridge in the lava part of the level, as he reaches the second half of one of the logs, he begins to weigh down the log. If you switch to Homer Ball, he logs becomes less weighed down than when he was regular Homer, despite the fact that Homer Ball is basically an obese and more overweight Homer.
Other mistake: Grand Theft Scratchy: Two shots after Marge says "I just don't understand why Bart would want to play this game" shows three cats in a car pulling up to shoot three mice walking on the street. The cats take out their guns, aim straight at the mice and start shooting at them. The shot then cuts to the mice, completely unharmed and start shooting the cats. Before the shot cut to the mice, the cats were shooting their guns for a full 1-2 seconds. If the cats had their guns aimed directly at the cats and started shooting, even for this short amount of time, the mice would already be dead even before they could take their guns out.
Other mistake: Level 5 "Mob Rules" cutscene: After Lisa gives Marge the manual and explains Marge's superpower to her, when Marge shouts, "Okay, let's stop that video game," Lisa's moving head was not properly edited by the layout artists, note that Lisa's head and neck are disconnected from her body, which is a bit creepy looking as she moves her head.
Other mistake: Level 10 "Bargain Bin" cutscene: When the spaceship flies over the house all the Simpsons walk out the front door, and in this overhead shot part of the house is missing, note the animation is incomplete behind the roof of the garage.
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.
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.
Other mistake: Mob Rules: In the opening cutscene for Bartman Begins, Uter, Ralph, Jimbo, Dolph and Kearney are seen queueing outside the Sequel Stop store. In the opening cutscene for Mob Rules, the exact same group of people can be seen coincidentally queueing outside the same store, despite the passage of time.
Other mistake: Big Super Happy Fun Game: When the three Sparklemon confront Milhouse, they begin beating him up, but it is very clear their fists are not touching his body.
Other mistake: Five Characters In Search Of An Author: When Bart begins inserting the key cards into the slots, we can see that all four of the slots are all different colours (purple, blue, red, pink). The key cards are supposed to be inserted into the slot that matches its colour. But he is shown inserting the blue keycard into the red slot.
Other mistake: Bargain Bin: When Marge and Lisa get out of the elevator after arriving at the theatre, Maggie cannot be seen in Marge's arms. She was transported to Game Engine along with the other Simpsons and was being carried by Marge. So there is no reason at all why Maggie would be absent here.
Other mistake: Lisa the Tree Hugger: When the logger finishes telling Bart and Lisa about how his daddy was a logger and his daddy before that, Bart is shown looking straight forward to his left to face the two loggers, before pretending to go to sleep. It then cuts to a wide shot of the four of them, and the two loggers can be seen ahead of Bart to his right. At this angle, he wouldn't have been able to be face-to-face with them if he was facing to the left.
Other mistake: Game Over: When Ralph puts down the game controller after he realises the player is looking at him, the controls on the controller don't appear to resemble actual buttons. They look more like circles with no distinct features.
Other mistake: Game Over: In the flashback of God losing the Simpsons Game manual whilst playing the game, when the flashback starts, he is shown pressing the buttons as if he were playing, and then takes out the manual because he has difficulty with the camera settings. But on the TV, we can see that the intro cutscene for Bartman Begins is playing, so he shouldn't have been using the controller at all for that part of the game.
Other mistake: Game Over: When everyone reaches heaven after climbing the stairway, there are a few other characters with them, such as Barney, Private Burns and two Game Engine workers. These characters are never heard from again for the rest of the level. They are not present in any of the gameplay, the cutscenes or even the rest of the opening cutscene after the gate closes, despite having the same goals as the Simpsons.
Other mistake: Game Over: Once Lisa has finished building the stairway to heaven out of Springfield buildings, the main characters and a crowd of at least twenty people are shown beginning to run up the stairway. Once they reach heaven, there are only about four other characters shown running through the heaven gates alongside the Simpsons.
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.
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.
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.
Other mistake: Bargain Bin: Homer pushes Bart away from the computer so that he can play solitaire. He presses a button to open the DVD player, but the button is never shown pushing downwards. It remains in a fixed position when he presses it.
Other mistake: Big Super Happy Fun Fun Game: After the level has been completed and the village is made clean again, Milhouse begins to shrink back down from his Mr Dirt form to his human form. In the shot of him beginning to shrink, after his royal gear fades away, his eyebrows are temporarily missing.
