• 
  Judd Apatow

  regizor
• 
  Jon Favreau

  regizor

• 
  Ben Stiller

  Rex
• 
  Will Ferrell

  Dave
• 
  Jay Baruchel

  Steven Karp
• 
  Charlie Hunnam

  Lloyd Haythe
• 
  Monica Keena

  Rachel Lindquist
• 
  Sarah Carter

  Evie

• 
  Mike White
• 
  Adam Sandler

  Adam Sandler
• 
  Jeremy Howard

  Totem Pole (2 episodes, 2001)
• 
  Katharine Towne

  Rebecca (1 episode, 2001)
• 
  Geoffrey Arend

  Jimmy (1 episode, 2002)
• 
  Kellee Stewart

  Student (1 episode, 2001)
• 
  Kyle Gass

  Eugene (2 episodes, 2001-2002)

• 
  Youki Kudoh

  Kikuki (1 episode, 2002)
• 
  Jason Segel

  Eric (7 episodes, 2001-2002)
• 
  Kevin Rankin

  Lucien  (4 episodes, 2001-2003)
• 
  Sarah Hagan

  Jordanna (1 episode, 2001)
• 
  Kevin Christy

  Pledge (2 episodes, 2001)
• 
  Loudon Wainwright III

  Hal Karp (13 episodes, 2001-2003)
• 
  Mary Kay Place

  Mrs. Lindquist (1 episode, 2002)
• 
  Alexandra Breckenridge

  Celeste  (2 episodes, 2001-2002)
• 
  Amy Wright

  Debra Karp (1 episode, 2002)
• 
  Erik Stolhanske

  Photographer (1 episode, 2002)
• 
  David Krumholtz

  Greg (2 episodes, 2001-2002)
• 
  Adam Alexi-Malle

  Professor Burg (1 episode, 2002)
• 
  Tom Welling

  Tom (1 episode, 2001)
• 
  Steve Bannos

  Dingleberry (2 episodes, 2001)
• 
  Greg Mottola

  Young professor (1 episode, 2001)
• 
  Martin Starr

  Theo (1 episode, 2002)
• 
  Carla Gallo

  Lizzie Exley (17 episodes, 2001-2003)
• 
  Clement Blake

  Antonio (1 episode, 2002)
• 
  Jordan Black

  Card Guy (1 episode, 2001)
• 
  Michael Beardsley

  Dormie with Chip (1 episode, 2001)
• 
  Fred Willard

  Professor Duggan (1 episode, 2002)
• 
  Timm Sharp

  Marshall Nesbitt (17 episodes, 2001-2003)
• 
  Kelly Karbacz

  Jane (1 episode, 2002)
• 
  Mandy Freund

  Red Headed Woman (1 episode, 2001)
• 
  Gerry Bednob

  Mr. Burundi (2 episodes, 2001-2002)
• 
  Sarah Jane Morris

  Jana (2 episodes, 2001)
• 
  Busy Philipps

  Kelly (2 episodes, 2002)
• 
  Amy Poehler

  Hillary (2 episodes, 2002)
• 
  Monica Allgeier

  Friend (1 episode, 2002)
• 
  Lacey Beeman

  Brandi (2 episodes, 2001)
• 
  Blake Shields

  Henry (1 episode, 2002)
• 
  Jenna Fischer

  Betty  (2 episodes, 2001)
• 
  Seth Rogen

  Ron Garner (17 episodes, 2001-2003)
• 
  Joel McKinnon Miller

  Mr. Nesbitt (1 episode, 2002)
• 
  Kevin Hart

  Luke (3 episodes, 2002-2003)
• 
  Alexa Davalos

  Susan (1 episode, 2002)
• 
  Samm Levine

  Books (2 episodes, 2001)
• 
  Lizzy Caplan

  Beautiful Girl (1 episode, 2001)
• 
  Christina Payano

  Tina Ellroy
• 
  Jarrett Grode

  Perry
• 
  Leroy Adams

  Adam