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