Kristen Bell Sarah Marshall
Rose Byrne Jackie Q
Jonah Hill Aaron Green
Aziz Ansari Matty Briggs
Elisabeth Moss Daphne Binks
Tom Felton Tom Felton
Sean Combs Sergio Roma
Colm Meaney Jonathan Snow
Carla Gallo Destiny
Jake Johnson Jazz Man
Kristen Schaal Today Show Production Assistant
Nick Kroll Kevin McLean
T.J. Miller Brian
Mario López Self
Judd Apatow Producer
Ellie Kemper Pinnacle Executive
Doc Duhame Stunts
Richard Vane Executive Producer
Christine Nguyen Lap Dancer in Vegas
Dee Snider Dee Snider
Russell Brand Aldous Snow
Ato Essandoh Smiling African Drummer
Jamie Sives Aldous's Mate in London
Wendy Hoffmann ADR Voice Casting
Da'Vone McDonald Sergio's Security Guard
Ellen H. Schwartz Unit Production Manager
Derek Theler Standard Guest
Meredith Vieira Meredith Vieira
Jessica Ellerby Club Girl in London
Meghan, Duchess of Sussex Tatiana
Tonya Kay Model
Jim Piddock Limousine Driver in London
Lino Facioli Naples
Lindsey Broad Pocket Dial Girl
Natalina Maggio Hot Club Dancer
Nicholas Dashnaw Stunts
Lars Ulrich Self
Jeff 'JJ' Dashnaw Stunt Coordinator, Second Unit Director
Rino Romano Announcer (voice)
Christina Aguilera Self
Rodney Rothman Producer
Lonnie Henderson American Soldier (uncredited)
Jeanne McCarthy Casting
Jason Segel Characters, Co-Producer
Rick Schroder Ricky Schroder
Greg Steele ADR Mixer
Nicholas Stoller Director, Writer, Producer
Ariel Gold Key Costumer
Sarah Sprague Production Coordinator
Anne Fletcher Choreographer
Stephanie Faracy Wendy
Carlos Jacott Navigator Driver in Vegas
Joe Bucaro III Stunts
Richard Boyle Best Boy Grip
Ross Simpson Boom Operator
Gary J. Perticone Key Hair Stylist
Larry Kemp Dialogue Editor
Jonathan Ryland Servant Dude
Chris Wilson London Executive
Kenny Davis Dolly Grip
Harry Zimmerman First Assistant "B" Camera
Pink Self
Jill Brown Stunts
Cindy Marty Sound Effects Editor
Billy Bush Billy Bush
Ray Siegle Paparazzo in LA
Pharrell Williams Self
Ranjani Brow ADR Voice Casting
Troy Robinson Stunts
Chamonix Bosch Second Second Assistant Director
Andrew Burlinson Hipster in Crowd at Standard Hotel
Kurt Loder Kurt Loder