Tom Hanks as Self

Jason Alexander as self

Jack Black as Self

Cedric the Entertainer as Self

Larry David as Self

Leonardo DiCaprio as Self

Will Ferrell as George W. Bush

Faith Hill as Self

Dustin Hoffman as Self

Richard Jenkins as Self

Jenifer Lewis as Self

Julia Louis-Dreyfus as Self

Bill Maher as Self

Steve Martin as Self

Tim McGraw as Self

Virginia Newcomb as Self

Kevin Sateri as Self

Matthew Shaffer as Self

Ben Stiller as Self

Wanda Sykes as Self

William Wessley as Self

Robin Williams as Self

Meeghan Henry as Child (uncredited)

Jim Lovell as Self

Eric Idle as Self

Cohl Klop as Global Warming Protector

Robert Smigel as Triumph the Insult Comic Dog

Martin Short as Nathan Thurm

Robert F. Kennedy Jr. as Self

Conan O'Brien as Self

Ray Romano as Self

Kevin Nealon as Self

Dana Carvey as Self

Al Franken as Self

Jeffrey Tambor as Self

Rob Corddry as Self (archived footage)

David Letterman as Self (archived footage)