Series 
Continuity: When Jerry is eating the black and white cookie in the bakery, sometimes the vanilla side is on the left and sometimes it is on the right. It keeps switching between shots.
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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.
Trivia
When Jerry, Elaine, and Susan are at the movie "Chunnel", Susan is annoyed while Jerry and Elaine are talking during the movie. Listen to the movie dialogue in the background of the scene. The voice which yells "Everyone out of the chunnel!" is that of co-creator Larry David. See more...
Seinfeld (1990) - 2 mistakes in "The Dinner Party"
starring Jason Alexander, Jerry Seinfeld, Julia Louis-Dreyfus, Michael Richards (add more)
The Dinner Party (season 5, episode 13)
Continuity: The bite size of the cookie that Jerry is eating changes between shots, without him even taking another bite.
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