Jason Segel
Peter Bretter
Kristen Bell
Sarah Marshall
Mila Kunis
Rachel Jansen
Russell Brand
Aldous Snow
Bill Hader
Brian Bretter
Jonah Hill
Matthew Van Der Wyk
Liz Cackowski
Liz Bretter
Jack McBrayer
Darald
Maria Christina Thayer
Wyoma
Paul Rudd
Chuck
Jason Bateman
Animal Instincts Detective
William Baldwin
Detective Hunter Rush
Kristen Wiig
Yoga Instructor
Da'Vone McDonald
Dwayne
Steve Landesberg
Dr. Rosenbaum
Kalani Robb
Helpful Hawaiian Waiter
Murray Miller
Photographer
Taylor Wily
Kemo
Kala Alexander
Greg
Francesca Delbanco
Hostess at Buffet
Branscombe Richmond
Keoki
Billy Bush
Billy Bush (Himself)
Peter Gray Lewis
Suspect on Animal Instincts
Trula M. Marcus
Lawyer on Crime Scene
Kirk Fox
Mixer
Ahna O'Reilly
Leslie
Tanisha Harper
Model
Carla Gallo
Gag Me Girl
Cynthia Lamontagne
Female Bartender
Max Alexander
Big Dracula Head
Carla Alapont
Spanish Sex Girl
Michael Oosterom
Puppeteer
Peter Salett
Keyboard Player
Jesse Heiman
Theater Audience Member (uncredited)