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Walter Brennan as D.J. Mulrooney / Knobby |
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Matthew Garber as Rodney |
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Karen Dotrice as Elizabeth |
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Richard Deacon as Ralph Yarby |
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Sean McClory as Horatio Quaxton |
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Ed Wynn as Rufus |
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Jerome Cowan as Dr. Ramsey |
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Charles Lane as Dr. Scoggins |
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Gil Lamb as Gas Attendant |
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Maudie Prickett as Katie Barrett |
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Cami Sebring as Violet |
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Tom Lowell as Jasper |
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Norman Grabowski as Male Nurse |
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Ellen Corby as Etta Pettibone (uncredited) |
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Byron Foulger as Hotel Desk Clerk (uncredited) |
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Dee Carroll as Secretary (uncredited) |
| Directing | Robert Stevenson | Director |
| Camera | Edward Colman | Director of Photography |
| Art | Carroll Clark | Art Direction |
| Art | William H. Tuntke | Art Direction |
| Art | Emile Kuri | Set Decoration |
| Art | Hal Gausman | Set Decoration |
| Visual Effects | Peter Ellenshaw | Matte Painter |
| Crew | Eustace Lycett | Special Effects |
| Crew | Robert A. Mattey | Special Effects |
| Sound | Robert O. Cook | Sound Supervisor |
| Sound | Dean Thomas | Sound Mixer |
| Costume & Make-Up | Bill Thomas | Costume Design |
| Costume & Make-Up | Chuck Keehne | Costumer |
| Costume & Make-Up | Neva Rames | Costumer |
| Costume & Make-Up | La Rue Matheron | Hairstylist |
| Costume & Make-Up | Pat McNalley | Makeup Artist |
| Sound | Evelyn Kennedy | Music Editor |
| Editing | Norman R. Palmer | Editor |
| Directing | Arthur J. Vitarelli | Second Unit Director |
| Production | Joseph L. McEveety | Unit Manager |
| Directing | Paul Cameron | Assistant Director |
| Sound | Buddy Baker | Original Music Composer |
| Sound | Wayne Robinson | Orchestrator |
| Sound | Robert B. Sherman | Songs |
| Sound | Richard M. Sherman | Songs |
| Writing | Ellis Kadison | Screenplay |
| Writing | Upton Sinclair | Novel |
| Production | James Algar | Co-Producer |
