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Peter Ustinov as Marcus Pendleton / Caesar Smith |
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Maggie Smith as Patty Terwilliger Smith |
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Karl Malden as Carlton J. Klemper |
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Bob Newhart as Willard C. Gnatpole |
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Robert Morley as Caesar Smith |
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Cesar Romero as Customs Inspector |
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Elizabeth Counsell as Miss Glyn |
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Margaret Courtenay as Mrs. Hubbard |
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Lynda Baron as Louise the Waitress |
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Sean Barry-Weske as Hippie in Boutique |
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Paul Dawkins as Pritchard |
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Paul Farrell as Larry |
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Raymond Huntley as Bayswater |
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Peter Jones as Prison Governor |
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Anthony Sharp as Hollis |
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Kynaston Reeves as Quayle |
| Directing | Eric Till | Director |
| Writing | Ira Wallach | Writer |
| Writing | Peter Ustinov | Writer |
| Production | Mildred Freed Alberg | Producer |
| Production | Irene Howard | Casting |
| Production | Douglas Twiddy | Production Manager |
| Directing | Mike Higgins | Third Assistant Director |
| Editing | John Grover | Assistant Editor |
| Directing | Joy Mercer | Continuity |
| Camera | Kenneth Higgins | Director of Photography |
| Editing | Richard Marden | Editor |
| Sound | Laurie Johnson | Original Music Composer |
| Directing | Ted Sturgis | Assistant Director |
| Camera | Peter Allwork | Camera Operator |
| Sound | A.W. Watkins | Recording Supervision |
| Sound | Gerry Turner | Sound Recordist |
| Sound | Allan Sones | Sound Editor |
| Sound | J.B. Smith | Sound Mixer |
| Costume & Make-Up | Germinal Rangel | Costume Design |
| Art | William C. Andrews | Art Direction |
