- Bill Murray
- Bob "Bobby" Wiley
- Richard Dreyfuss
- Dr. Leo Marvin
- Julie Hagerty
- Fay Marvin
- Charlie Korsmo
- Sigmund "Siggy" Marvin
- Kathryn Erbe
- Anna Marvin
- Tom Aldredge
- Mr. Guttman
- Susan Willis
- Mrs. Guttman
- Roger Bowen
- Phil
- Fran Brill
- Lily Marvin
- Frank Oz
- Director
- Tom Schulman
- Screenwriter
- Alvin Sargent
- Writer
- Laura Ziskin
- Producer, Writer
- Miles Goodman
- Original Music
- Michael Ballhaus
- Cinematographer
- Anne V. Coates
- Film Editing
- Glenn Daniels
- Casting
