Continuity mistake: The Land of Chocolate: At the start of the dream, Homer is standing under a "Land of Chocolate" sign. Three chocolate rabbits hop by Homer, and Homer begins hopping with them. The chocolate rabbits have a light chocolate colour as they hop by, but by the following shot, their skin has become a lot darker.
Continuity mistake: The Land of Chocolate: The chocolate rabbits who hop with Homer have pink eyes in one shot, but regular human-like eyes in the next.
Continuity mistake: Bartman Begins: After Bart has stopped Jimbo, Jimbo is telling him to stop freaking him out with his abilities. As he says this, beside Jimbo is a dinosaur coccyx positioned on a purple part of the floor. Jimbo then tells him they are henchmen and the coccyx has moved to a blue part of the floor.
Other mistake: Bartman Begins: Homer and Bart are in a dinosaur exhibit, trying to get Bart to fly off the dinosaur skeleton to the other side, whilst also fighting off some guards, and the exhibit continues through the next room where they are stopping Dolph. In these parts of the level, night time is visible outside of the windows - it is supposed to be day time during this level.
Revealing mistake: The Land of Chocolate: When Homer wakes up from his dream, their is a wrapper on his shirt from one of the Hershel's Smoochies chocolates. The wrapper looks nowhere near convincing and is just a poorly animated squiggle - the wrapper on his shirt is supposed to be scrunched up, but it is drawn as a 2D shape and is animated onto his shirt.
Continuity mistake: Bartman Begins: When Bart shows the Squeaky Voiced Teen the Cal's Calzone Frequent Calzone Eaters card, he first has three fingers placed on the card - one above the other finger with the side of his finger placed on the card and the same for the second one below it and a third finger pushed against the second. In a sudden close-up of the card, it is now four fingers pushed against the back of the card.
Revealing mistake: Bartman Begins: After Bart has pulled the lever to open the door to the second dinosaur exhibit, travel back through that opened door and back through the exit door to the first dinosaur exhibit. There is also another positioned directly behind the entrance door. There are several frames at this moment where the door will just vanish completely.
Continuity mistake: Bartman Begins: Bart exits the video game store with the Grand Theft Scratchy game. When he is saying that teenagers are so dumb, the front cover of the game is facing away from Bart. Marge then appears and takes the game off him - the front cover is suddenly facing Bart.
Bug: Game Over: When battling God, several dead people charge after you and you have to jump onto each of the arrow keys that the dead people walk onto in order to electrocute them. Sometimes during this (mostly during round 3), if you jump onto the arrow key the dead person runs onto, the arrow key may not electrocute the dead person running onto it.
Continuity mistake: Game Over: When the Simpsons meet God, the Simpsons go from looking at God to looking 90° in the opposite direction between shots.
Continuity mistake: Game Over: On the Wii and PSP versions, just as the opening cutscene finishes, Shakespeare is standing atop the gates to heaven, but as soon as the level starts, Shakespeare is standing on the ground.
Other mistake: Game Over: When Homer and Bart are battling Shakespeare, if the player transforms into Homer Ball and Shakespeare starts throwing skulls, the skulls will go straight through Homer.
Continuity mistake: Five Characters In Search Of An Author: Maggie suddenly appears on Marge's baby carrier as soon as the game engine start to crumble. She nor the baby carrier attached to Marge was never visible at any point before this.
Continuity mistake: Five Characters In Search Of An Author: When Matt Groening unveils the Game Engine self destruct button, the painting hiding it changes position in relation to the self destruct button between shots.
Deliberate mistake: Five Characters In Search Of An Author: Various times throughout this level, Matt Groening draws on some paper and some cartoons come to life. Whenever this happens, he only draws on one piece of paper, yet several pieces of are shown with cartoons on them.
Continuity mistake: Five Characters In Search Of An Author: After you have reached the interior of the mansion, try and run up a staircase as Bart. If you change the camera angle to an aerial shot and walk up the staircase, a chandelier will appear. If you do nothing the chandelier will just vanish from shot, despite not having moved.
Continuity mistake: Five Characters In Search Of An Author: When the Simpsons enter the gate to go to Matt Groening's mansion, the mansion is shown to be almost a few miles behind the gate. Later as the intro clip starts and Homer and Bart have reached the mansion, the key card gate is only a few yards in the background. Then as the level starts, there is now a gate to the mansion in the background and the gate that requires key cards is now way behind the gate to the mansion.
Continuity mistake: Five Characters In Search Of An Author: Whenever you approach the golden gate in the Game Engine game play, the four slots to place the key card in are the same colour. When the Simpsons and poorly rendered Simpsons approach the gate at the start of the level, the four key card slots all match each colour of the key card and not the gate itself.
Character mistake: Big Super Happy Fun Fun Game: During the battle between Homer and Lisa and Sherri and Terri (who are both female), just as Lisa unleashes Linguo, Lisa says "Linguo, fix his grammar for good." In this context, it should be "her" or "their."
Plot hole: Whilst you are in the Game Engine, Homer may say at one point, "Turtle bride, why didn't I think about that?" This is a clear reference to Professor Frink's turtle bride we met earlier in Enter The Cheatrix. The main problem with this quote is that Homer didn't even know about Professor Frink's turtle bride. It was only Bart and Lisa who even knew about the turtle bride as they rescued Frink and only them who rescued Frink in Enter The Cheatrix and met the turtle bride soon after. And although, Frink was in that large box in the theatre, the only thing he ever did was to give Homer and Lisa a power upgrade. Plus, the turtle bride was never visible in the theatre and Bart and Lisa never mentioned this to him.
