- as Peter Bretter
- as Sarah Marshall
- as Rachel Jansen
- as Aldous Snow
- as Brian
- as Liz
- as Wyoma
- as Darald
- as Kemo
- as Dwayne
- as Dr. Rosenbaum
- as Matthew the Waiter
- as Chuck
- as Greg
- as Helpful Hawaiian Waiter
- as Keoki
- as Himself
- as Detective Hunter Rush
- as Animal Instincts Detective
- as Suspect on 'Animal Instincts'
- as Lawyer on 'Crime Scene'
- as Ann at the Bar
- as Leslie
- as Model
- as Gag Me Girl
- as Photographer
- as Big Dracula Head
- as Keyboard Player
- as Hotel Manager
- as Female Bar Patron
- as Yoga Instructor
- as Mr. Lopez
- as Spanish Sex Girl
- as Puppeteer
- as Puppeteer
- as Fan
- as Musical Actor
- as Willow
- as Theatre Audience Member
- as Flight Attendant
- as Makani
- as Herself (Archive footage)
Watch "Forgetting Sarah Marshall":