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Walter Matthau as Sam Nash / Jesse Kiplinger / Roy Hubley |
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Maureen Stapleton as Karen Nash |
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Barbara Harris as Muriel Tate |
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Lee Grant as Norma Hubley |
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Louise Sorel as Miss McCormack |
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Dan Ferrone as bellboy |
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Jose Ocasio as room service waiter |
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Thomas Carey as Borden Eisler |
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Jenny Sullivan as Mimsey Hubley |
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Augusta Dabney as Mrs. Eisler |
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Alan North as Mr. Eisler |
| Directing | Arthur Hiller | Director |
| Writing | Neil Simon | Theatre Play |
| Production | Howard W. Koch | Producer |
| Camera | Jack A. Marta | Director of Photography |
| Art | Reg Allen | Set Decoration |
| Sound | Ben Winkler | Sound |
| Art | Arthur Lonergan | Production Design |
| Costume & Make-Up | Joan Phillips | Hairstylist |
| Writing | Neil Simon | Writer |
| Costume & Make-Up | Gary Morris | Makeup Artist |
| Sound | David Dockendorf | Sound |
| Costume & Make-Up | Jack Bear | Costume Design |
| Sound | Maurice Jarre | Original Music Composer |
| Editing | Frank Bracht | Editor |
| Art | Dan Perri | Title Designer |
