Tom Hanks

Character: Self

Jason Alexander

Character: self

Jack Black

Character: Self

Cedric the Entertainer

Character: Self

Larry David

Character: Self

Leonardo DiCaprio

Character: Self

Will Ferrell

Character: George W. Bush

Faith Hill

Character: Self

Dustin Hoffman

Character: Self

Richard Jenkins

Character: Self

Jenifer Lewis

Character: Self

Julia Louis-Dreyfus

Character: Self

Bill Maher

Character: Self

Steve Martin

Character: Self

Tim McGraw

Character: Self

Virginia Newcomb

Character: Self

Kevin Sateri

Character: Self

Matthew Shaffer

Character: Self

Ben Stiller

Character: Self

Wanda Sykes

Character: Self

William Wessley

Character: Self

Robin Williams

Character: Self

Meeghan Henry

Character: Child (uncredited)

Jim Lovell

Character: Self

Eric Idle

Character: Self

Cohl Klop

Character: Global Warming Protector

Robert Smigel

Character: Triumph the Insult Comic Dog

Martin Short

Character: Nathan Thurm

Robert F. Kennedy Jr.

Character: Self

Conan O'Brien

Character: Self

Ray Romano

Character: Self

Kevin Nealon

Character: Self

Dana Carvey

Character: Self

Al Franken

Character: Self

Jeffrey Tambor

Character: Self

Rob Corddry

Character: Self (archived footage)

David Letterman

Character: Self (archived footage)