Kate Beckinsale Donna Newman
Adam Sandler Producer, Michael Newman
Jennifer Coolidge Janine
Christopher Walken Morty
Terry Crews Singing Driver (uncredited)
Cameron Monaghan Kevin O'Doyle
Jonah Hill Ben at 17 years old
Sean Astin Bill
Rob Schneider Prince Habeeboo (uncredited)
Katie Cassidy Samantha at 27 years old
Henry Winkler Ted
James Earl Jones Narrator of Michael's Past (voice) (uncredited)
Julie Kavner Trudy
David Hasselhoff Ammer
Rachel Dratch Alice / Alan
Blake Clark Roy (uncredited)
Jorge Garcia Ammer in SAP scene (uncredited)
Nick Swardson Bed, Bath & Beyond Guy
Jana Kramer Julie
Gary A. Hecker Foley Artist
Neal H. Moritz Producer
Carolyn Hennesy Kathy O'Doyle
Rick Baker Special Effects Makeup Artist
Lily Mo Sheen Lakeside Camp Girl
Toshi Toda Watsuhita Executive
Jake Hoffman Ben at 22-30 years old
Tim Herlihy Executive Producer, Doctor
Barry Bernardi Executive Producer
Perry Andelin Blake Production Design
Sophie Monk Stacy
Marco Khan Habeeboo Entourage
J.J. Perry Stunts
Howard London ADR Mixer
Spencer Kayden Bar Patron (uncredited)
Clinton Wayne Prosthetic Makeup Artist
Tatum McCann Samantha at 5 years old
Bill Corso Prosthetic Makeup Artist
Vanessa Motta Stunts
Roger Mussenden Casting
Frank Coraci Director, Male Nurse
Elmo Weber Supervising Sound Editor
Michelle Lombardo Linda
Paul Eliopoulos Stunt Coordinator, Stunt Double
Steve Koren Producer, Writer
Elliott Cho Ping Woo
Rupert Gregson-Williams Original Music Composer
Joseph Castanon Ben at 7 years old
Dolores O'Riordan Singer
Ian Fox "A" Camera Operator
Jack Giarraputo Producer
Michael Yama Watsuhita Head Executive
Armen Ksajikian Musician
Tony Rivetti Sr. First Assistant "A" Camera
Max Daniels Stunts
David V. Butler Dialogue Editor
Kevin Grady Co-Producer
Jenae Altschwager Judy
Melissa Kostenbauder Casting Assistant
John Collins Assistant Art Director
Billy Slaughter Newman Employee (uncredited)
Kazu Hiro Prosthetic Supervisor
Michael J. Broomberg Foley Artist
Blake Neely Conductor
Vasilios Tanis Makeup Artist
Russell Farmarco Supervising ADR Editor
Cameron Steenhagen Dialogue Editor
James J. Gilson Chief Lighting Technician
Jeff Mossa Art Direction
Kim Heath Key Rigging Grip
Ann Pala Makeup Department Head
John C. Hartigan Special Effects Coordinator
Lorraine Nicholson Samantha at 14 years old