Continuity: When Morty is giving Jerry directions to the scuba diving site, the pen alternates between being in Morty's hand and on the table 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
The man who returns George's $20 bill and says "Sorry, your highness, but we don't accept bills with lipstick on the president", is the show's co-creator Larry David. See more...
Movie Mistakes blog
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15 Transformers mistake pictures
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Seinfeld (1990) - 2 mistakes in "The Pen"
starring Jason Alexander, Jerry Seinfeld, Julia Louis-Dreyfus, Michael Richards (add more)
Updates: 
Series 8
The Pen (season 3, episode 3)
Revealing: While Jack is leaving the apartment after giving Jerry the pen, you can see they have put a fake background outside the front door. What's more it is not even that realistic. It looks like a forest with a river in the middle. The Seinfeld's Florida apartment is situated amongst many other apartments around it.
You may also like: Friends | Frasier | Family Guy | Transformers: Revenge of the Fallen | The Dark Knight
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