Will Ferrell (Harold Crick)
Maggie Gyllenhaal (Ana Pascal)
Dustin Hoffman (Professor Jules Hilbert)
Queen Latifah (Penny Escher)
Emma Thompson (Karen 'Kay' Eiffel)
Guy Massey (IRS Co-Worker 2)
Martha Espinoza (IRS Co-Worker 3)
T.J. Jagodowski (IRS Co-Worker 4)
Peter Grosz (IRS Co-Worker 5)
Ricky Adams (Young Boy)
Christian Stolte (Young Boy's Father)
Denise Hughes (Kronecker Bus Driver)
Peggy Roeder (Polish Woman)
Tonray Ho (IRS Co-Worker 6)
Danny Rhodes (Bakery Employee 1)
Helen Young (Bakery Customer 1)
David Pompeii (Bakery Customer 2)
Linara Washington (Bakery Employee 2)
Larry Neumann Jr. (Homeless Man)
John Mohrlein (Man With Hose)
Bruce Jarchow (Commuter)
Kristin Chenoweth (Book Channel Host)
Bradley Mott (Large Man on Bus)
John Watson, Sr. (TV Author)
David Wiegers (Bakery Customer 3)
Jarret Sleeper (Bakery Customer 4)
Karen Lloyd (Customer With Tan)
Keith Kupferer (Demolition Foreman)
Danny McCarthy (Demoliton Crew)
Tab Baker (Demolition Crew)
Mark Buettner (Claw Operator)
Christian Young (ER Doctor 1)
Arraon Hixson (Young Male Patient)
Bryan Kelly (ER Orderly)
Whitney Sneed (ER Nurse 1)
Ray Kurut (ER Doctor 2)
Michael Cook (ER Doctor 3)
Cheryl Lynn Bruce (Head ER Nurse)
Chet Dubowski (Man in Tweed)
Oran "Juice" Jones (Banneker Press Receptionist)
Jordan Keller (Grocer)
Herb Lichtenstein (IRS Co-Worker 7)
Stacey Jackson (IRS Co-Worker 8)
Jordan Teplitz (Old Man on Phone)
Ricardo Guiterrez (Bus Company Manager)
James Mazza (Irritated Man on Bus)
Oscar Roxas (Another Man on Bus)
Nadiera Bost (Accident Witness)
Sandra Marquez (Accident Witness)
Lacy Coil (Accident Witness)
Will Clinger (Accident Witness)
Albert Samuels (Accident Witness)
Frank Caeti (Accident Witness)
Andrew Rothenberg (Doctor Mercator)
Rengin Altay (Nurse)
Tony Hale (Dave)
Lucinda Kemp (Bus Operator)
Donna Watkins (Bus Operator)
Julien Heron (Animal Footage Voiceover)
Bob Papenbrook (Animal Footage Voiceover)
Mike McColl (Animal Footage Voiceover)
Tom Hulce (Doctor Cayly)
Linda Hunt (Doctor Mittag-Leffler)
William Dick (IRS Co-Worker 1)