In every episode of Seinfeld, there is either a visual reference or a mention of Superman

Larry David provided the voice of the George Steinbrenner character in "Seinfeld"

Kenny Kramer, who was the basis for his namesake in Seinfeld, ran a bus tour through New York City which visited sites seen in the show. The bus tour was parodied in an episode of the show

George's costume designers intentionally made his clothing one size too small to make his appear unhip

Julie Louis-Dreyfus did not appear in the pilot episode of Seinfeld

Contrary to pop culture lore, the fake holiday "Festivus" was not created by Seinfeld writers. It was conceived in a 1966 issue of Reader's Digest