Jason Lee as Dave
David Cross as Ian
Cameron Richardson as Claire
Jane Lynch as Gail
Justin Long as Alvin
Matthew Gray Gubler as Simon
Jesse McCartney as Theodore
Veronica Alicino as Amy

Alexandra Welker as Costume Design
Ali Dee as Songs
Arnon Milchan as Executive Producer
Chris Viscardi as Author
Christopher Lennertz as Music
Janice Karman as Producer
Jon Vitti as Author
Julianne Jordan as Music
Karen Rosenfelt as Executive Producer
Michele Imperato as Executive Producer
Mindy Marin as Casting
Peter E. Berger as Editor
Peter Lyons Collister as Director of Photography
Richard Holland as Production Design
Ross Bagdasarian as Producer
Steve Waterman as Executive Producer
Tim Hill as Director
Will McRobb as Author