Wolfpack Only: The Hangover Retrospective

A documentary that explores the making of The Hangover Trilogy. It includes Zach's unlikely audition as "Alan," the truth behind Ed Helms missing tooth, the casting of a drug-dealing monkey and the wildly improbable rendezvous with a former president.

Full Cast of Wolfpack Only: The Hangover Retrospective

Paul Giamatti as Self

Paul Giamatti

Self
 Zach Galifianakis as Self

Zach Galifianakis

Self
 Heather Graham as Self

Heather Graham

Self
 Ed Helms as Self

Ed Helms

Self
 Bradley Cooper as Self

Bradley Cooper

Self
 John Goodman as Self

John Goodman

Self
 Mike Tyson as Self

Mike Tyson

Self
 Ken Jeong as Self

Ken Jeong

Self