Great sites
Quotes
Kramer: It's a write off for them.
Jerry: Write it off what?
Kramer: They just write it off.
Jerry: You don't even know what a write off is, do you?
Kramer: Do you?
Jerry: No, I don't.
Kramer. Well they do, and they're the ones writing it off.
Jerry: I wish I had the last 20 seconds of my life back.
Mistakes
Throughout the whole show, George Costanza is showed as being left-handed (eg. at the beginning of the episode titled "The Shoes", Jerry and George are writing "The Butler" script, and George can clearly be seen writing with his left hand). However, the actor himself is not, and you can spot some episodes (mostly in the first seasons) but a few in the last seasons as well, with him using his right hand for writing or eating, while in most of the show he's using his left-hand for everything. See more...
Trivia
In most episodes of Seinfeld there is a Superman reference somewhere. See more...
Seinfeld (1990) - 63 episodes with mistakes
starring Jason Alexander, Jerry Seinfeld, Julia Louis-Dreyfus, Michael Richards (add more)
Below is a list of every episode on the site for Seinfeld which has mistakes in it - if your favourite episode's not listed, that just means it's flawless! So far... "All of series 1" and similar entries are those mistakes which apply an entire series, but not across the whole show. They're also counted as episodes, so don't be surprised if the total up top doesn't reflect the actual number of episodes recorded for a show. This list is ordered by series, then episode title by default - click the options below to change the ordering.