Melvin Frank Director, Producer, Screenwriter George Segal Adam Actor Glenda Jackson Tricia Actor Maureen Stapleton Jemmy Actor Hollis McLaren Eden Actor John Cunningham Lenny Actor Paul Sorvino Reilly Actor Ken Pogue Julian Actor Janie Sell Zelda Actor Diana Barrington Ellie Actor Leslie Carlson Jean-Paul Actor John Candy Carpentier Actor Cec Linder Mr. Sanders Actor Jack Rose Screenwriter Arnold Kopelson Executive Producer Douglas Slocombe Cinematographer Bill Butler Film Editing John Cameron Original Music Trevor Williams Production Design Ted Tester Art Director Gerry Holmes Set Decoration Julie Harris Costume Design