The Airport - S4-E12
Corrected entry: When Kramer tells George that Jerry and Elaine's flight has been rerouted again, they both leave and George still has the Time magazine with him. Did he steal it?
Correction: Probably. It wouldn't be out of character for George to steal the magazine.
Corrected entry: Kramer walks into Jerry's apartment to get a Pepsi and tells Jerry that he would get Jerry's watch back (the one that Jerry threw away). Jerry then goes to Kramer's apartment door. When Kramer leaves Jerry's apartment, he has the Pepsi in his right hand. When Jerry tells Kramer that he had thrown away the watch, the Pepsi can is gone.
Correction: There was a promotion being run, for which you had to spot the Pepsi can in particular episodes and send in a postcard pointing out when you saw the Pepsi can.
The Outing - S4-E17
Corrected entry: George's mother says when she was reading about George being gay, she fell off the toilet, and the superintendent had to help her. Well, the Costanzas live in a private house, and thus have no superintendent.
Correction: There's no reason to assume the Costanzas own the house they live in. They could easily be renting it, in which case they WOULD have a superintendent, or similar maintence person/manager etc. that Estelle refers to as a superintendent.
Corrected entry: When Kramer is modeling underwear for the Calvin Klein people, he leans and slides against a wall leaving a large spot of body makeup.
Correction: And how is that a mistake? Models wear makeup too, you know.
The Contest - S4-E11
Corrected entry: When George tells the story of how his mother caught him, he says his parents were supposed to be at work. But in the hospital, his mother says she's thankful George's father was in Chicago.
Corrected entry: The directions that Kramer finds to the cabin were actually the directions to The Bubble Boy's house, but he still ends up at the cabin.
Correction: Susan actually takes the directions to The Bubble Boy's house with her when she leaves Jerry's apartment. We can presume Jerry previously got the directions to the cabin, and left them on his counter.
Corrected entry: Russell doesn't know that Elaine knows Jerry and George. This is apparent when Russell tells her about a pilot with a "new young talent, Jerry Seinfeld." So why doesn't he figure it out when there is a character named Elaine Benes in Jerry's show?
Correction: I don't remember Russell ever saying he didn't know that Elaine knew Jerry and George. Furthermore what would be the problem if he did? Elaine dated Russell, but she never conned him and it wouldn't have likely changed anything about the situation. As for the character in the show, I don't think they actually referred to the characters by their full name. I believe Elaine's character was just referred to as Elaine.
The Airport - S4-E12
Corrected entry: When Jerry and Elaine are trying to get on the plane, they are told that the plane is full except for two seats, one in first class and one in coach. However, Elaine is later able to find an empty seat in first class, but there were only two openings, when they boarded.
Correction: People will often enough buy a ticket in advance, then not show up. The Computer will still register the seat as sold, and whoever it is might not have called ahead to tell them he couldn't make it.
Correction: The coffe cup is Elaine's and it doesn't disappear, you just can't see it from certain camera angles.