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Roddy McDowall as Alan Musgrave |
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Tuesday Weld as Barbara Ann Greene |
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Lola Albright as Marie Greene |
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Martin West as Bob Bernard |
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Ruth Gordon as Stella Bernard |
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Harvey Korman as Weldon Emmett |
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Sarah Marshall as Miss Schwartz |
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Lynn Carey as Sally Grace |
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Donald Murphy as Phil Neuhauser |
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Max Showalter as Howard Greene |
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Joseph Mell as Dr. Milton Lippman (as Joe Mell) |
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Dan Frazer as Honest Joe |
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Martine Bartlett as Inez |
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Jo Collins as Kitten |
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Judith Loomis as Butch Neuhauser |
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David Draper as Billy Gibbons |
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Peter Adams as Frank (uncredited) |
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Martin Gabel as T. Harrison "Harry" Belmont (uncredited) |
| Directing | George Axelrod | Director |
| Writing | George Axelrod | Writer |
| Writing | Larry H. Johnson | Writer |
| Writing | Al Hine | Novel |
| Production | George Axelrod | Producer |
| Sound | Neal Hefti | Original Music Composer |
| Camera | Daniel L. Fapp | Director of Photography |
| Editing | William A. Lyon | Editor |
| Production | Kerwin Coughlin | Casting |
| Art | Malcolm Brown | Art Direction |
| Art | Raphael Bretton | Set Decoration |
| Costume & Make-Up | Paula Giokaris | Costume Design |
| Costume & Make-Up | Sugar Blymyer | Hairstylist |
| Costume & Make-Up | Louis Hippe | Makeup Artist |
| Directing | Herman E. Webber | Assistant Director |
| Sound | Lodge Cunningham | Sound |
| Sound | Al Overton Sr. | Sound |
| Crew | Herman E. Townsley | Special Effects |
| Crew | Dick Dial | Stunts |
| Crew | Louie Elias | Stunts |
| Directing | Dorothy Hughes | Script Supervisor |
