 | Walter Matthau als Willy Clark |
 | George Burns als Al Lewis |
 | Richard Benjamin als Ben Clark |
 | Lee Meredith als Nurse in Sketch (Miss McIntosh) |
 | Carol Arthur als Mrs. Doris Green, Al's Daughter |
 | Rosetta LeNoire als Odessa, Willy's nurse |
 | F. Murray Abraham als Mechanic |
 | Howard Hesseman als Mr. Walsh, Commerical Director |
 | James Cranna als Mr. Schaeffer, TV Director |
 | Ron Rifkin als T.V. Floor Manager |
 | Fritz Feld als Mr. Gilbert |
 | Phyllis Diller als Herself |
 | Steve Allen als Himself |
| Jennifer Lee als Helen Clark |
| Herbert Ross | Director |
| Neil Simon | Writer |
| Albert Brenner | Production Design |
| Regina Gruss | Unit Publicist |
| Dick Smith | Makeup Artist |
| Ray Stark | Producer |
| Roger M. Rothstein | Associate Producer |
| Irwin Fisch | Music |
| David M. Walsh | Cinematography |
| John F. Burnett | Editor |
| Jennifer Shull | Casting |
| Marvin March | Set Decoration |
| Patricia Norris | Costume Design |
| Gary Daigler | Second Assistant Director |
| Jack Roe | Assistant Director |
| Stephen Myles Berger | Assistant Art Director |
| Dennis J. Parrish | Property Master |
| Jerry Jost | Sound |
| Harry W. Tetrick | Sound |
| Roger Shearman Jr. | Camera Operator |
| Mel Traxel | Still Photographer |
| Seth Banks | Costumer |
| Margaret Booth | Supervising Editor |
| Patrick M. Crawford | Assistant Editor |
| Michael A. Stevenson | Assistant Editor |
| Harry V. Lojewski | Music Supervisor |
| Marshall Schlom | Script Supervisor |
| Tony Elmaleh | Dialogue Coach |
| Wayne Fitzgerald | Title Designer |
