Elaine hates smoking: dumps keith hernandez when he lights up, tells George she would never marry a smoker, fights with psychic over smoking Yet... she smokes cigars in "The Pizanos", "The Foundation" and "The Blood". Plus, she buys cigarettes for her love interest "Vincint" in 'The Comeback'.
Kramer doesn't like baths: in "The Showerheads" (I just took a bath, jerry! 'micro organisms...having sex all around me. it's disgusting.') Yet when elaine asks once in an earlier show, it's "I take bathes". strange.
Kramer doesnt know you can come out of Coma's (8th season, "Comeback") but during season 3 he watched Martin awake from a 2-3 day coma, and discusses the whole 'looting' thing if a coma victim doesnt wake up in so many hours.
George talks about a brother in 2 episodes, both to a psycic ("the ??"), & Jerry ("the Space"). what happened with that?? so i conclude, Seinfeld is merely a show, not a survelance monitor of Mr. Seinfeld's life. take it back.