Jason Segel

Character: Peter Bretter

Kristen Bell

Character: Sarah Marshall

Mila Kunis

Character: Rachel Jansen

Russell Brand

Character: Aldous Snow

Bill Hader

Character: Brian Bretter

Jonah Hill

Character: Matthew Van Der Wyk

Liz Cackowski

Character: Liz Bretter

Jack McBrayer

Character: Darald

Maria Thayer

Character: Wyoma

Paul Rudd

Character: Chuck

Jason Bateman

Character: Animal Instincts Detective

William Baldwin

Character: Detective Hunter Rush

Kristen Wiig

Character: Yoga Instructor

Da'Vone McDonald

Character: Dwayne

Steve Landesberg

Character: Dr. Rosenbaum

Kalani Robb

Character: Helpful Hawaiian Waiter

Murray Miller

Character: Photographer

Taylor Wily

Character: Kemo

Kala Alexander

Character: Greg

Francesca Delbanco

Character: Hostess at Buffet

Branscombe Richmond

Character: Keoki

Billy Bush

Character: Billy Bush (Self)

Peter Gray 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

Carla Alapont

Character: Spanish Sex Girl

Michael Oosterom

Character: Puppeteer

Peter Salett

Character: Keyboard Player

Jesse Heiman

Character: Theater Audience Member (uncredited)

Gedde Watanabe

Character: Hotel Manager