• 
  Jake Kasdan

  regizor

• 
  John C. Reilly

  Dewey Cox
• 
  Jenna Fischer

  Darlene
• 
  Odette Annable
• 
  Jane Lynch

  Gail the Television Reporter
• 
  Jack Black

  Paul McCartney
• 
  Stephanie Katz

  Hotel Groupie with Dewey
• 
  E.J. Callahan

  Second Man at Talent Show

• 
  Willow Geer

  Rehab Nurse
• 
  Amy Minderhout

  Backup Singer
• 
  Patrick Faucette

  Bad Men Bass Player
• 
  Chris Parnell

  Theo
• 
  Terrence Beasor

  Country Doctor
• 
  Amy Ferguson

  Teenager
• 
  Gerry Black

  Harmonica Player

• 
  Paul Rudd

  John Lennon
• 
  Frankie Muniz

  Buddy Holly
• 
  Harold Ramis

  L'Chaim
• 
  Jason Schwartzman

  Ringo Starr
• 
  Nat Faxon

  Awards Show Stage Manager
• 
  Raymond J. Barry

  Pa Cox
• 
  George Anton

  Hotel Groupie
• 
  Jack White

  Elvis Presley
• 
  Bruce Williamson

  The Temptations
• 
  Jack McBrayer

  DJ
• 
  John D. Crawford

  Officer Clark
• 
  David Krumholtz

  Schwartzberg
• 
  Hannah Leigh

  Dewey's Little Sister
• 
  Phil Rosenthal

  Mazeltov
• 
  Caleb Babcock

  Dewey's son
• 
  Conner Rayburn

  Dewey - Age 8
• 
  Oscar Dillon

  Audience Guy at Nightclub
• 
  Steve Bannos

  Gardian
• 
  Martin Starr

  Schmendrick
• 
  Molly C. Quinn

  Teen with Pinups
• 
  Geoffrey Gould

  Sound Engineer
• 
  Tim Meadows

  Sam
• 
  Don Abernathy

  Pygmy Bushman/Man in 50's Club
• 
  John Ennis

  The Big Bopper
• 
  Jack Kehler

  Press Conference Reporter
• 
  Tony Swift

  Backstage crew
• 
  Margo Martindale

  Ma Cox
• 
  Norma Jean

  Punk Rocker
• 
  Lurie Poston

  Cox Kid
• 
  Craig Robinson

  Bobby Shad
• 
  Clement Blake

  Edith's Father
• 
  John Michael Higgins

  Record Producer
• 
  Rance Howard

  Preacher
• 
  Paul Feig

  Different DJ
• 
  Gregory George Frank

  Parent/Stagehand
• 
  Gerry Bednob

  The Maharishi
• 
  Matt Besser

  Dave
• 
  Adam Herschman

  Jerry Garcia
• 
  Frederick Lawrence

  Stagehand
• 
  Paul Bates

  Nightclub Manager
• 
  Michael William Arnold

  Dewey's Kid 1970
• 
  Danielle E. Hawkins

  Music Video Dancer
• 
  Jonah Hill
• 
  Patrick J. Adams

  The Kid
• 
  Kristen Wiig

  Edith
• 
  Ed Helms

  Stage Manager
• 
  Tim Bagley

  Engineer
• 
  Hedwig Herzog
• 
  Morgan Fairchild

  Morgan Fairchild
• 
  Justin Long

  George Harrison
• 
  Matt Price

  MC (Teacher)
• 
  Honeyboy Edwards

  Old Bluesman (as David Honeyboy Edwards)
• 
  Chip Hormess

  Nate
• 
  Christopher Hurt

  Teenage Band
• 
  Taylor Hubert

  Teenage Band (as Taylor Jamison Hubert)
• 
  Aron Johnson

  Teenage Band
• 
  Jack Donovan Saperstein

  Teenage Band (as Jack Saperstein)