- Fred MacMurray
- Prof. Ned Brainard
- Nancy Olson
- Elizabeth 'Betsy' Brainard
- Keenan Wynn
- Alonzo P. Hawk
- Tommy Kirk
- Biff Hawk
- Ed Wynn
- A.J. Allen
- Charles Ruggles
- Judge Murdock
- Leon Ames
- President Rufus Daggett
- Ken Murray
- Mr. Hurley
- William Demarest
- Mr. Hummel
- Paul Lynde
- Sportscaster
- Elliott Reid
- Prof. Shelby Ashton
- Bob Sweeney
- Mr. Harker
- Joanna Moore
- Desiree de la Roche
- Edward Andrews
- Defense Secretary
- James Westerfield
- Police Officer Hanson
- Alan Carney
- Referee
- Stuart Erwin
- Coach Wilson
- Forrest Lewis
- Police Officer Kelly
- Alan Hewitt
- Prosecutor
- Jack Albertson
- Mr. Barley
- Eddie Ryder
- Mr. Osborne
- Harriet E. MacGibbon
- Mrs. Edna Daggett
- Beverly Wills
- Mother in Commercial
- Wally Boag
- George -- Father in Commercial
- Don Ames
- Bailiff
- Chet Brandenburg
- Courtroom Well-Wisher
- Ron Brown
- Football Player
- Steve Carruthers
- Military Officer
- Charlie
- Dog
- Paul Cristo
- Party Guest
- Russell Custer
- Board Member
- Christopher Dark
- Police Captain / TV Broadcaster (voice) (uncredited)
- Lindy Davis
- Newsboy / First Hobgoblin (uncredited)
- Don Edmonds
- Moriarity
- Joe Flynn
- Rex Williams
- George Ford
- Courtroom Spectator
- Byron Foulger
- Proprietor
- Michael Garrett
- Air Force General
- Lee Giroux
- Newscaster
- James Gonzalez
- Courtroom Spectator
- Norman Grabowski
- Rutland Football Player #33
- Darby Hinton
- 2nd Hobgoblin
- Clegg Hoyt
- George
- Henry Hunter
- Admiral
- Michael Jeffers
- Courtroom Well-Wisher
- Virgil Johansen
- Board Member
- Gordon Jones
- Rutland Coach
- Harvey Korman
- Husband in Commercial
- Ethan Laidlaw
- Courtroom Well-Wisher
- Mari Lynn
- Wife in Commercial
- Don Mcart
- #1 Medfield Football Player
- Tipp McClure
- Police Officer
- Mathew McCue
- Board Member
- Dal McKennon
- First Juror
- Walter Elias Disney Miller
- Baby in Commercial
- King Mojave
- Board Member
- Belle Montrose
- Mother in Commercial
- Brad Morrow
- First Football Player
- Burt Mustin
- 1st Bailiff
- Ron Nyman
- Courtroom Spectator
- William H. O'Brien
- Butler at Halloween Party
- J. Pat O'Malley
- Sign-Painter
- John Olszewski
- Rutland Football Player #15
- Robert Perry
- Letterman in Court 9
- Murray Pollack
- Courtroom Spectator
- Tony Randall
- Courtroom Spectator
- Waclaw Rekwart
- Courtroom Spectator
- Jack Rice
- Second Juror
- Leoda Richards
- Party Guest
- Robert Robinson
- Courtroom Well-Wisher
- Clark Ross
- Courtroom Spectator
- Hope Sansberry
- Secretary
- Phil Schumacher
- Courtroom Well-Wisher
- Robert Shayne
- Defense Secretary's Assistant
- Hal Smith
- Bartender
- Arthur Tovey
- Juror
- Ginny Tyler
- Baby Walter
- Leon Tyler
- Humphrey Hacker
- Ned Wynn
- Rutland Student Manager
