Famous Actors Who Appeared on Seinfeld Before They Became A-List Stars

Patton Oswalt

Image Source:: Dan MacMedan-USA TODAY

Episode: “The Couch” (Season 6, Episode 5)

Like Silverman, Oswalt primarily began his entertainment career as an actor. His unique vocal intonation — coupled with his uncanny timing — made him a perfect choice for a cameo appearance. On Seinfeld, Oswalt played a video store clerk.