The Bizarro Jerry (Season 8 Episode 3).
Jason Beck is Bouncer in
The Fusilli Jerry (Season 6 - Episode 21).
Jeff Coopwood is Security Guard in
The Opposite (Season 5 Episode 13).
Jeffrey von Meyer is Poker Player #4 in
Jeremiah Birkett is Jean-Paul (or Jean-Paul Jean-Paul), the runner from Trinidad and Tobago in The Hot Tub (Season 7 Episode 5).
The Big Salad (Season 6 - Episode 2).
Jerry Levine is the stationery store guy in
Jerry Stiller is Frank Costanza, George's father in 27 episodes. His first appearance was in The Handicap Spot (Season 4 Episode 22).