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Peter Sellers as Dr. Albert T. Hopfnegal |
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Jo Ann Pflug as Alice Gilligan |
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Rick Lenz as Lester Hammond |
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Harold Gould as Dr. Herman Zerny |
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Eve Bruce as Nurse Lamarr |
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J. Edward McKinley as George Leffingwell, Hospital Commissioner |
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Hope Summers as Nurse Throttle |
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Pat Morita as Harry Nishimoto |
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Norman Alden as Katzen |
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Brett Halsey as Dr. Paolo Quagliomo |
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Anitra Ford as Nurse |
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Kathleen Freeman as Mrs. Manzzini |
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William Elliott as Oscar |
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Uschi Digard as Girl at Party (uncredited) |
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Paul Lambert as Dr. Bernie Pinikhes |
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Keith Allison as Hinkley |
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Albert Reed as Dr. Sam Radcliffe |
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Jean Byron as Dr. Kincaid |
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Lynn Cartwright as Switchboard Operator |
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Jackie Russell as Mother with Newborn Baby |
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Richard Hoyt as Sergeant Hoyt |
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Joe Corey as Cab Driver Assisting Mother with Baby |
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Anitra Ford as Nurse at Reception Desk |
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Lenore Kasdorf as Dianne - Lester's Girlfriend |
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Kathleen Freeman as Mrs. Mazzini |
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Marvin Miller as Catering Manager |
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Jack Mullaney as Mr. Leffingwell's Male Secretary |
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Paul Gleason as Mr. Leffingwell's Aide |
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William Elliott as Oscar the Orderly |
| Directing | Rod Amateau | Director |
| Writing | Rod Amateau | Novel |
| Writing | Budd Robinson | Novel |
| Production | Josef Shaftel | Executive Producer |
| Production | Rod Amateau | Producer |
| Production | William Schwartz | Producer |
| Production | Rosalee Berman | Producer |
| Production | John Marwick | Producer |
| Sound | Keith Allison | Music |
| Camera | Brick Marquard | Director of Photography |
| Art | Tony Sarzi-Braga | Production Design |
| Art | Jack Morrisey | Art Department Coordinator |
| Art | Dave Smith | Construction Foreman |
| Production | David Hawks | Production Manager |
| Directing | Duane Toler | Script Supervisor |
| Crew | William Flannigan | Production Office Assistant |
| Sound | John Speak | Sound mixer |
| Sound | John McDonald | Boom Operator |
| Costume & Make-Up | Frank Tauss | Costume Design |
| Costume & Make-Up | Del Acevedo | Makeup Artist |
| Crew | "Jockey" Liebgold | Property Master |
| Writing | Biff Elliot | Dialogue |
| Production | Bonnie Godfrey | Casting |
| Production | Frank Tucker | Location Manager |
| Crew | Susan Perkins | Production Office Assistant |
| Directing | William Lasky | Assistant Director |
| Art | Michael D. Haller | Art Direction |
| Production | Frank Bueno | Producer |
| Editing | Mario Morra | Editor |
| Editing | Stanley Rabjohn | Editor |
| Production | Tony Sarzi-Braga | Production Designer |
| Lighting | Calvin Maehl | Best Boy Electric |
| Lighting | Ross A. Maehl | Electrician |
| Camera | Ken John Borland | Key Grip |
| Camera | David Dalzell | Assistant Camera |
| Camera | Roger Mace | Still Photographer |
| Camera | 'Big John' Marwick | Grip |
| Camera | Richard Wimpy | Camera Operator |
| Costume & Make-Up | Frank Tauss | Costumer |
| Costume & Make-Up | Dodie Warren | Wardrobe Assistant |
| Art | Monroe Liebgold | Property Master |
