Factual error: At the end of the episode in which George and Susan get engaged, they are lying in bed together watching "Mad About You" on TV. However, at some earlier point on "Mad About You" it had been established in a crossover episode that Paul Reiser was the person who lived in Jerry's apartment before him and was an old acquaintence of Kramer's, meaning that "Seinfeld" and "Mad About You" existed in the same reality. On "Seinfeld," the show "Mad About You" could not exist.

Deliberate "mistake": In the scene where Elaine comes homes and doesn't find Sean Paul there, she runs to her neighbour across the apartment. The neighbour opens the door and stands outside it then the door slowly closes behind him. Suddenly, the door opens again with a swoosh without anyone being there. Because the camera switches angle right after this, it is apparent it was opened to gain this shot or to at least permit it continuity wise.

Plot hole: When Elaine is searching for Jean Paul in the streets, one of her verbal flashbacks is of Jean Paul saying, "I trust Elaine, she is my friend." However, Jean Paul made this remark to Jerry, and Elaine was not there to hear it. How could she have a flashback of it?

Revealing: When Kramer says "I read it in Wall Street Weekly," his mouth does not sync with the words. It looks like he said "Wall Street Journal."

Plot hole: When George and Jerry are discussing the rye bread scheme, George says Susan is working late that night, so she won't be around when he sneaks the rye into the house. But when George reels the rye in with the fishing pole, Susan is standing there with her parents, wearing her coat. When did she get home? She couldn't have entered through the front door, because Jerry was there tossing the rye up to George. And since it's a New York City brownstone, there's no backdoor that's accessible. There's no logical explanation for her getting into the house to see George reeling in the rye.

Continuity: In the scene where Elaine and Kramer are in Newman's apartment to debate who gets the bike, the first shot of Newman shows he inadvertently left his wedding ring on. The shot switches away and then back to Newman and his wedding ring disappears.

Continuity: When George is at Susan's cousins' house complaining about them stealing the name Seven, its bright Daylight out. You can tell because the sun is pouring in through the windows. The woman goes into labor and they all get into the car to go to the hospital. At this point it is nighttime. When they finally arrive at the hospital it is broad daylight again.

Continuity: When George and Susan are arguing over dinner about her cousin stealing the name Seven, Susan holds her glass up to her mouth in one shot. In the very next shot, the glass is on the table.

Deliberate "mistake": When Kramer picks up the Maestro's baton and starts to shoot, he calls "6 in the corner." He knocks in a solid black ball, obviously the 8.

Continuity: This mistake is in the Calzone episode. Towards the end when George walks in and his boss is looking around for the smell of calzones, George is holding a bag in his hand. In the next shot that shows the back of the boss's head the bag is now on top of a box that George is carrying. When it goes back to a close up the bag is in his hand again.

Factual error: When Jerry gets a speeding ticket, he asks Nicki to give the officer the registration. She gets a large piece of white paper from the glove compartment. That's what car registrations look like in California, where the show was produced. In New York, where it's supposed to take place, car registrations are the size of a driver's license, and are usually kept in the driver's wallet.

Continuity: The scene which George arrives at Beth's apartment in a messy condition to admit his remark was in jest, his shirt's hem and collar change between shots. During this scene, especially when he talks to Jerry on the phone, his collar is up and down; his hem is in and out of his trousers.