- Robert Downey Jr.
- Harry Lockhart
- Val Kilmer
- Gay Perry
- Michelle Monaghan
- Harmony Faith Lane
- Corbin Bernsen
- Harlan Dexter
- Dash Mihok
- Mr. Frying Pan
- Larry Miller
- Dabney Shaw
- Rockmond Dunbar
- Mr. Fire
- Shannyn Sossamon
- Pink Hair Girl
- Angela Lindvall
- Flicka
- Indio Falconer Downey
- Harry, age 9
- Ariel Winter
- Harmony, age 7
- Duane Carnahan
- Chainsaw Kid
- Josh Richman
- Rickie
- Martha Hackett
- Pistol Woman
- Bill McAdams Jr.
- NY Cop
- Nancy Fish
- NY Casting Woman
- Tanja Reichert
- B-Movie Actress
- Jake McKinnon
- Creature
- Stephanie Pearson
- Teen Harmony
- Chris Gilman
- Protocop
- Brendan Fehily
- Local News Reporter
- David Newsom
- Agent Type
- Judie Aronson
- Gift Bag Girl
- Ali Hillis
- Marleah
- Wiley Pickett
- Homicide Cop
- Joe Keyes
- Lobby Cop
- Daniel Bobby Tuttle
- Hotel Concierge
- Jake Eberle
- Patrol Cop
- Saida Pagan
- News Anchor
- Lela Edgar
- Party Girl
- Daniel Browning Smith
- Rubber Boy
- Teresa Herrera
- Newswoman
- Kathy Lamkin
- Woman in Hospital Blues
- Evan Parke
- Dexter Clinic Guard
- Vincent Laresca
- Aurello
- Brian Simpson
- Dexter Goon
- Cole S. McKay
- Dexter Goon
- Ben Hernandez Bray
- Dexter Goon
- Harrison Young
- Harmony's Dad
- Shane Black
- Director, Producer, Writer
- Joel Silver
- Producer
- Steve Richards
- Executive Producer
- Michael Barrett
- Cinematographer
- Jim Page
- Film Editing
- John Ottman
- Original Music
- Aaron Osborne
- Production Design
- Erin Cochran
- Art Director
- Jeannie Gunn
- Set Decoration
- Mary-Margaret Stratton
- Set Decoration
- Christopher J. Kristoff
- Costume Design
- Mary Gail Artz
- Casting
- Barbara Cohen
- Casting
