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Jack Lemmon as Peter Wilson |
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Barbara Harris as Terry Kozlenko |
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Jason Robards as Stephen Kozlenko |
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Herb Edelman as Howard Mann |
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Lisa Gerritsen as Linda Kozlenko |
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Moosie Drier as David Kozlenko |
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Severn Darden as Dr. Harris |
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Lisa Eilbacher as Caroline Kozlenko |
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Lucille Meredith as Mrs. Schenker |
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Ruth McDevitt as Elderly Woman |
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Joey Faye as Delivery Boy |
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Alan DeWitt as Man #1 |
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John Zaremba as Minister |
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Richard Gates as Bernie |
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Lea Marmer as Old Hag |
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Janya Braunt as Nurse |
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Olive Dunbar as Woman #1 |
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Margaret Muse as Woman #5 |
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Bill Hickman as Large Gentleman |
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Joyce Brothers as Herself |
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Ruth Foster as Wedding Guest (uncredited) |
| Directing | Melville Shavelson | Director |
| Sound | Sam Horta | Sound Effects Editor |
| Writing | Danny Arnold | Writer |
| Writing | Melville Shavelson | Writer |
| Production | Michael McLean | Casting |
| Sound | Marvin Hamlisch | Original Music Composer |
| Art | Stan Jolley | Production Design |
| Production | Jack Lemmon | Executive Producer |
| Camera | Charles F. Wheeler | Director of Photography |
| Editing | Frank Bracht | Editor |
| Art | Robert R. Benton | Set Decoration |
| Production | Danny Arnold | Producer |
| Art | Donald B. Nunley | Property Master |
| Art | Stephen Myles Berger | Set Designer |
| Camera | Enrique Bravo | Camera Operator |
| Visual Effects | Dale Case | Key Animation |
| Camera | Ray Marcos | Best Boy Grip |
| Costume & Make-Up | Lambert Marks | Costumer |
| Directing | Catalina Lawrence | Script Supervisor |
| Costume & Make-Up | Jerrie Woods | Costumer |
| Production | Austen Jewell | Production Manager |
| Camera | Dick Johnson | Camera Operator |
| Camera | Frank Palmer | Assistant Camera |
| Lighting | Harry Sundby | Gaffer |
| Camera | Josh Weiner | Still Photographer |
| Visual Effects | Mark Kausler | Animation |
| Directing | Mike Moder | Assistant Director |
| Sound | John Speak | Sound Engineer |
| Sound | John Speak | Sound Supervisor |
| Costume & Make-Up | Harry Ray | Makeup Artist |
| Camera | Jack Harris | Still Photographer |
| Sound | Rocky Moriana | Music Editor |
| Sound | John McDonald | Boom Operator |
| Costume & Make-Up | Gary Liddiard | Makeup Artist |
| Costume & Make-Up | Lynn Masters | Hairdresser |
| Costume & Make-Up | Gloria Montemayor | Hairstylist |
| Production | William A. Porter | Unit Manager |
| Directing | Terry Carr | Second Assistant Director |
| Editing | Ruth Blythe | Assistant Editor |
| Visual Effects | Robert Dranko | Animation Supervisor |
