Jason Alexander as Self

Chris Albrecht as Self - HBO Chairman / CEO

Hank Azaria as Self

Shelley Berman as Self

Steven Gary Banks as Billy the Mime (as Billy the Mime)

Lewis Black as Self

Mario Cantone as Self

George Carlin as Self

Drew Carey as Self

Mark Cohen as Self

Scott Thompson as Self

Billy Connolly as Self

Hugh Hefner as Self (archive footage) (uncredited)

Jimmy Kimmel as Self (archive footage) (uncredited)

Paul Provenza as Self (uncredited)

Rob Schneider as Self (archive footage) (uncredited)

Pat Cooper as Self

Wayne Cotter as Self

Andy Dick as Self

Frank Digiacomo as Self - Journalist

Phyllis Diller as Self

Susie Essman as Self

Carrie Fisher as Self

Joe Franklin as Self

Todd Glass as Self

Judy Gold as Self

Whoopi Goldberg as Self

Gilbert Gottfried as Self

Dana Gould as Self - Writer / Producer

Allan Harvey as Self

Eric Idle as Self

Dom Irrera as Self

Eddie Izzard as Self

Richard Jeni as Self

Jake Johannsen as Self

The Amazing Johnathan as Self (as Amazing Johnathan)

Jay Kogen as Self - Writer / Producer

Sue Kolinsky as Self

Paul Krassner as Self - Satirist / Editor, 'The Realist'

Cathy Ladman as Self

Lisa Lampanelli as Self

Richard Lewis as Self

Wendy Liebman as Self

Howie Mandel as Self

Merrill Markoe as Self

Jay Marshall as Self

Jackie Martling as Self (as Jackie 'The Joke Man' Martling)

Chuck McCann as Self

Michael McKean as Self

Eric Mead as Self

Larry Miller as Self

Martin Mull as Self

Kevin Nealon as Self

Taylor Negron as Self

Otto Petersen as Self

Rick Overton as Self

Gary Owens as Self

Owen Morse as Self

Jonathan Wee as Self

Penn Jillette as Self

Teller as Self

Peter Pitofsky as Self

Emo Philips as Self

Kevin Pollak as Self

Paul Reiser as Self

Andy Richter as Self

Don Rickles as Self

Chris Rock as Self

Gregg Rogell as Self

Jeff Ross as Self

Jon Ross as Self

Rita Rudner as Self

Bob Saget as Self

T. Sean Shannon as Self - Writer / Producer, SNL

Harry Shearer as Self

Sarah Silverman as Self

Bill Maher as Self

Bobby Slayton as Self

Dick Smothers as Self (as The Smothers Brothers)

Tom Smothers as Self (as The Smothers Brothers)

Doug Stanhope as Self

Carrie Snow as Self

David Steinberg as Self

Jon Stewart as Self

Larry Storch as Self

Rip Taylor as Self

Dave Thomas as Self

David Brenner as Self

Johnny Thompson as Self

Peter Tilden as Self

Bruce Vilanch as Self

Fred Willard as Self

Robin Williams as Self

Steven Wright as Self

Joe Garden as Self (Staff of the Onion)

Todd Hanson as Self (Staff of the Onion)

Tim Harrod as Self (Staff of the Onion)

Chris Karwowski as Self (Staff of the Onion)

Carol Kolb as Self (Staff of the Onion)

Maria Schneider as Self (The Onion Editorial Staff)

Trey Parker as Cartman / Stan (voice)

Matt Stone as Kyle / Kenny (voice)

Tim Conway as Man in Closing Credits

Eddie Gorodetsky as Self

Alan Kirschenbaum as Self - Writer / Producer