| Jim Carrey | ... | Peter Appleton |
 | Bob Balaban | ... | Elvin Clyde |
| Jeffrey DeMunn | ... | Ernie Cole |
| Hal Holbrook | ... | Congressman Doyle |
| Laurie Holden | ... | Adele Stanton |
| Martin Landau | ... | Harry Trimble |
| Brent Briscoe | ... | Sheriff Cecil Coleman |
| Ron Rifkin | ... | Kevin Bannerman |
| Gerry Black | ... | Emmett Smith |
| David Ogden Stiers | ... | Doc Stanton |
| James Whitmore | ... | Stan Keller |
| Susan Willis | ... | Irene Terwilliger |
| Catherine Dent | ... | Mabel |
| Brian Howe | ... | Carl Leffert / Head of the Studio |
| Karl Bury | ... | Bob Leffert |
| Chelcie Ross | ... | Avery Wyatt |
| Amanda Detmer | ... | Sandra Sinclair |
| Allen Garfield | ... | Leo Kubelsky |
| Daniel von Bargen | ... | Federal Agent Ellerby |
| Shawn Doyle | ... | Federal Agent Saunders |
| Mario Roccuzzo | ... | Jerry the Bartender |
| Frank Collison | ... | Subpoena Server |
| Bill Gratton | ... | Daley |
| Ginger Williams | ... | Louise |
| Ken Magee | ... | Coastal Engineer |
| Csilla Horvath | ... | Nurse Muriel |
| April Ortiz | ... | Vera |
| Larry Cox | ... | Grauman's Usher |
| Julie Richardson | ... | Grauman's Bon-Bon Girl |
| Scotty Leavenworth | ... | Joey |
| Grant Vaught | ... | Boy on Beach |
| Bob Wells | ... | Reverend |
| Kevin DeMunn | ... | Western Union Man |
| Earl Boen | ... | Newsreel Announcer (voice) |
| Bruce Campbell | ... | Roland the Intrepid Explorer |
| Cliff Curtis | ... | The Evil But Handsome Prince Khalid |
| Michael Sloane | ... | Kindly Old Professor Meredith |
| Garry Marshall | ... | Studio Executive (voice) |
| Paul Mazursky | ... | Studio Executive (voice) |
| Sydney Pollack | ... | Studio Executive (voice) |
| Carl Reiner | ... | Studio Executive (voice) |
| Rob Reiner | ... | Studio Executive (voice) |
| Matt Damon | ... | Luke Trimble (voice) |
| rest of cast listed alphabetically: |
| Matt G. Wiens | ... | Spencer Wyatt |
| Kris Andersson | ... | Dancer (uncredited) |
| Alvah Bessie | ... | Himself (Hollywood Ten, arrives, behind Cole) (archive footage) (uncredited) |
| Herbert J. Biberman | ... | Himself (Hollywood Ten, arrives) (archive footage) (uncredited) |
| Jennifer Blaire | ... | Carl's Date (uncredited) |
| Chris Carver | ... | Dancer (uncredited) |
| Lester Cole | ... | Himself (Hollywood Ten, arrives) (archive footage) (uncredited) |
| Lathan Crowe | ... | Casanova (uncredited) |
| Corey Foxx | ... | Photographer (uncredited) |
| Kate Greeke | ... | Popcorn Girl (uncredited) |
| Gordon Hart | ... | Swing Dancer (uncredited) |
| J. Edgar Hoover | ... | Himself (targets Communists) (archive footage) (uncredited) |
| Jesse Jensen | ... | Soldier (uncredited) |
| Mary Kircher | ... | Swing Dancer (uncredited) |
| Tony Laanan | ... | Grauman's Usher (uncredited) |
| Ring Lardner Jr. | ... | Himself (Hollywood Ten, arrives, behind Biberman) (archive footage) (uncredited) |
| John Howard Lawson | ... | Himself (Hollywood Ten, testifies) (archive footage) (uncredited) |
| Brian Libby | ... | Studio Guard Hal (uncredited) |
| Melissa S. Markess | ... | Swing Dancer (uncredited) |
| Amanda Melby | ... | Young Mrs. Trimble (uncredited) |
| Melissa Noble | ... | Swing Dancer (uncredited) |
| Samuel Ornitz | ... | Himself (Hollywood Ten, arrives) (archive footage) (uncredited) |
| Kimberly Prendez | ... | Girl at welcome home party (uncredited) |
| Maudie Purcell | ... | Old Lady (uncredited) |
| George Ratliff | ... | Dancer (uncredited) |
| Craig Richards | ... | Studio Guard (uncredited) |
| David Rosenbaum | ... | Swing dancer (uncredited) |
| Adrian Scott | ... | Himself (Hollywood Ten, arrives, behind Cole) (archive footage) (uncredited) |
| Gary Sommers | ... | FBI Agent (uncredited) |
| Robert Thorne | ... | FBI Agent (uncredited) |
| Jack Truman | ... | Party Member (uncredited) |
| Steven Paul Zsenyuk | ... | Driver / Theater Patron (uncredited) |
