Continuity mistake: Mob Rules: When Martin runs out of the video game store, there is a line of people queueing outside. A couple of seconds later, as Marge and Lisa watch Martin throw Ned out of his car, the video game store is visible in the background, and the queue has vanished.
Continuity mistake: Mob Rules: When Martin Prince carjacks Ned, the shot of Ned being thrown out of the car shows the car having a shadow. The shot changes to an overview angle of Martin driving away, and the car's shadow has vanished.
Continuity mistake: Mob Rules: As Martin Prince runs onto the road, Maggie is in her baby carrier looking forward. The shot cuts to Marge and Lisa watching Ned getting carjacked, and Maggie is suddenly looking behind her, watching the carjacking.
Continuity mistake: Mob Rules: After Ned has been carjacked, Marge and Lisa run out to help him. An Itchy and Scratchy billboard is on their right, but by the next shot, the Itchy and Scratchy billboard is behind them.
Continuity mistake: Mob Rules: When Ned has been carjacked, just as Marge and Lisa go over to him, there is a lamp post on the street corner, but as Marge asks Ned if he's hurt, the lamp post has vanished.
Revealing mistake: Mob Rules: When Mayor Quimby and the games producer are in the hot tub, the two of them are holding glasses filled with wine, but the wine always remains in fixed position, even if the glasses are being tilted to the side.
Continuity mistake: Mob Rules: When Mayor Quimby and the games producer first see the mob, there is a senator standing near the front. Grandpa Simpson is in the crowd behind the senator to her left. The shot cuts to a closer shot of the senator, and Grandpa Simpson is now directly behind her.
Continuity mistake: Mob Rules: When Homer talks about how much he wanted to be a human garbage disposal, there is a glass of milk in front of him. Two shots later, after Marge suggests if he should put his powers to good use, there is suddenly more milk in his glass.
Audio problem: Mob Rules: After Mayor Quimby bans Grand Theft Scratchy for minors, the mob is heard cheering, but none of their lips are moving with the cheers.
Audio problem: Mob Rules: When the Simpsons are at the breakfast table talking about their powers, Homer says "That was the greatest day of my life", but his mouth is both out-of-sync when he is speaking the second half of the line and his mouth also stops moving before he finishes.
Continuity mistake: Mob Rules: When Kang and Kodos are arguing, the Earth shown through the monitor changes entirely when the shot cuts. Extra land and additional clouds have suddenly appeared. The shot shown on the monitor is also much further away when the shot cuts.
Continuity mistake: Mob Rules: When the dolphins are charging towards the shore, the head dolphin, Snorky lays on a rock on land and turns to face the other dolphins, but from an overview angle, he is suddenly lying on the sand.
Continuity mistake: Mob Rules: When Springfield is being invaded, the Simpsons are in their home, with Marge and Lisa in the doorway and Homer hiding behind the door. Lisa then says "We've gotta do something", the entire doorway is visible in frame and Homer has suddenly vanished.
Continuity mistake: Enter the Cheatrix: When the ape snatches Professor Frink, Frink is holding the Simpsons game strategy guide with his left hand, but as the ape jumps into the pipe, the manual has vanished. He couldn't have dropped it as he gives it to Bart and Lisa later on.
Continuity mistake: Invasion of the Yokel Snatchers: Cletus confronts the aliens about their thieving. He is holding two coupons in his hand, which two shots afterward become three, then when one of the aliens takes them, there are suddenly six coupons in the alien's hand.
Continuity mistake: Invasion of the Yokel Snatchers: When Homer and Bart release Cletus, Homer and Bart's position on the floor changes between shots.
Continuity mistake: Bargain Bin: When the mothership arrives at the Simpson house, the family runs outside, standing next to the door and leaving it open. Lisa then says "it's the mothership" and the family are now standing in the garden with the door closed.
Deliberate mistake: Invasion of the Yokel Snatchers: When Kang is arguing with Kodos about not picking up his space rake, there is nothing on the floor around them. Kang walks forward a few feet and suddenly a rake suddenly appears on the floor.
Audio problem: Bargain Bin: When the mothership fires on the Simpsons, they are heard screaming, but their mouths are closed and not moving.
Continuity mistake: Bargain Bin: When Bart is looking up the Simpsons Game on the computer, there is a computer mouse next to the keyboard, located about a foot away, but by the next shot, the mouse has suddenly moved closer.
