Corrected entry: When George and Kramer go to the newsstand to get change for the $100 bill, the newsstand has multiple copies of Entertainment Weekly on the news racks. This wouldn't be a mistake if it had the same person(s) on the cover but each copy has a different person(s) on the cover. The show probably just grabbed whatever magazines they could find to take up space on the news rack.
Corrected entry: In the episode where George is hoping to buy a "discounted suit" there is a scene where he is talking to the foreign shop assistant. In the first shot he has the suit in his hands. The scene switches to the assistant, then back to George and on the second shot the suit is no longer in his hands.
Correction: The shop assistant took it out of his hands.
Corrected entry: When Kramer is asked about urinating in the shower, he replies "I take baths." But in the episode with the low-flow shower heads, Kramer is disgusted by taking a bath, saying he was "lying in a tepid pool of my own filth."
Correction: As Kramer is so different and constantly doing weird things, it is not too hard to believe that in one episode he takes baths and another one he is reviled by them and has changed to showers. That is the nature of his character, to be indecisive and strange.
Correction: Not necessarily, sometimes magazines like that have multiple covers (sort of collectible covers); TV Guide often does that with multiple stars of a featured program.
Xofer