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Jerry Lewis as Sidney L. Pythias |
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Darren McGavin as Mike Damon |
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Martha Hyer as Martha Henshaw |
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Robert Ivers as Monk |
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Horace McMahon as Capt. Riley |
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Richard Bakalyan as Artie |
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Joe Corey as Harry |
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Mary Webster as Patricia |
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Milton Frome as Mr. Herman |
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Jefferson Dudley Searles as Mr. Crow (as Jefferson Searles) |
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Dave Willock as William C. Goerner |
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Frank Gorshin as Neighborhood Street Punk |
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Emile Meyer as Sgt. Kelly |
| Directing | Don McGuire | Director |
| Production | Jerry Lewis | Producer |
| Camera | Haskell B. Boggs | Director of Photography |
| Writing | Don McGuire | Writer |
| Sound | Buddy Bregman | Original Music Composer |
| Editing | Howard A. Smith | Editor |
| Art | Sam Comer | Set Decoration |
| Art | A. Earl Hedrick | Art Direction |
| Costume & Make-Up | Edith Head | Costume Design |
| Art | Ray Moyer | Set Decoration |
| Art | Hal Pereira | Art Direction |
| Costume & Make-Up | Sy Devore | Wardrobe Designer |
| Directing | Richard Caffey | Assistant Director |
| Production | Jack Mintz | Producer's Assistant |
| Sound | Gene Merritt | Sound Recordist |
| Costume & Make-Up | Wally Westmore | Makeup Supervisor |
| Sound | Winston H. Leverett | Sound Recordist |
| Costume & Make-Up | Nellie Manley | Hair Supervisor |
| Crew | John P. Fulton | Special Effects |
