Which Seinfeld character does Patton Oswalt play when he is on the show?

Answer 1

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He was a clerk in the episode "The Couch"

http://www.imdb.com/title/tt0697681/

Answer 2

Not to be that guy, but to be more specific he was the movie store cashier. He was the guy who wouldn't tell George who rented Breakfast at Tiffany's. It was from the episode the The Couch.

Source(s): Butt loads of Seinfeld