Before going on vacation, self-involved psychiatrist Dr. Leo Marvin has the misfortune of taking on a new patient: Bob Wiley. An exemplar of neediness and a compendium of phobias, Bob follows Marvin to his family's country house. Dr. Marvin tries to get him to leave; the trouble is, everyone loves Bob. As his oblivious patient makes himself at home, Dr. Marvin loses his professional composure and, before long, may be ready for the loony bin himself.
| Directing | Frank Oz | Director |
| Writing | Tom Schulman | Screenplay |
| Production | Laura Ziskin | Producer |
| Sound | Miles Goodman | Original Music Composer |
| Camera | Michael Ballhaus | Director of Photography |
| Editing | Anne V. Coates | Editor |
| Production | Glenn Daniels | Casting |
| Art | Leslie Dilley | Production Design |
| Art | Jack Blackman | Art Direction |
| Art | Anne Kuljian | Set Decoration |
| Costume & Make-Up | Bernie Pollack | Costume Design |
| Art | Michael R. Clark | Painter |
| Sound | John K. Carr | Sound Editor |
| Visual Effects | Richard O. Helmer | Special Effects Supervisor |
| Crew | Michael Steve Jones | Stunts |
| Writing | Alvin Sargent | Story |
| Writing | Laura Ziskin | Story |
| Production | Bernard Williams | Co-Producer |
| Costume & Make-Up | Emanuel Millar | Hairstylist |
| Costume & Make-Up | Matthew W. Mungle | Makeup Artist |
| Production | David C. Anderson | Unit Production Manager |
| Directing | Donald J. Lee Jr. | Second Assistant Director |
| Directing | James W. Skotchdopole | First Assistant Director |
| Art | Russell Bobbitt | Property Master |
| Art | Roger G. Fortune | Set Designer |
| Art | Douglas Fox | Property Master |
| Art | Donald G. Helderle | Construction Foreman |
| Art | Frank B. Nieves | Construction Foreman |
| Art | Ken Scaife | Construction Coordinator |
| Art | Wayne Shepherd | Leadman |
| Art | Brett C. Smith | Set Dresser |
| Sound | Bruce Bell | Foley Mixer |
| Sound | Liz Carlin | Assistant Sound Editor |
| Sound | David Grannis | Assistant Sound Editor |
| Sound | Catherine Harper | Foley Artist |
| Sound | Devon Heffley Curry | ADR Editor |
| Sound | Pieter Hubbard | Sound Editor |
| Sound | David J. Hudson | Sound Re-Recording Mixer |
| Sound | Doc Kane | ADR Mixer |
| Sound | Kenneth C. Mantlo | Boom Operator |
| Sound | Mel Metcalfe | Sound Re-Recording Mixer |
| Sound | Bill Phillips | Supervising Sound Editor |
| Sound | John Phillips | Sound Editor |
| Sound | Terry Porter | Sound Re-Recording Mixer |
| Sound | Hal Sanders | Sound Editor |
| Sound | Scott Shadden | Assistant Sound Editor |
| Sound | Edward M. Steidele | Foley Artist |
| Sound | Ed White | Sound Mixer |
| Camera | Stuart Abramson | Key Grip |
| Camera | Florian Ballhaus | First Assistant Camera |
| Camera | Arthur Blum | Dolly Grip |
| Camera | David M. Dunlap | Camera Operator |
| Camera | Craig Kohtala | Best Boy Grip |
| Camera | Bobby Mancuso | Second Assistant Camera |
| Lighting | Robert W. Meyers | Rigging Gaffer |
| Lighting | James R. Tynes | Chief Lighting Technician |
| Camera | Barry Wetcher | Still Photographer |
| Costume & Make-Up | Hugo Peña | Costume Supervisor |
| Editing | Christopher Cibelli | Assistant Editor |
| Editing | James D.R. Hickox | Assistant Editor |
| Production | Sandy Isaac | Post Production Coordinator |
| Production | Charles Thomas Baxter | Location Manager |
| Sound | Nancy Fogarty | Music Editor |
| Directing | Susan Malerstein | Script Supervisor |
| Crew | Rafe Blasi | Unit Publicist |
| Production | Lisa Lynn Kearsley | Production Coordinator |
| Production | Tandi Slater | Production Accountant |
| Production | Dana Williams | Production Coordinator |
| Crew | Dennis Scott | Stunt Coordinator |
| Crew | Steve Hart | Stunts |
| Crew | James Kindelon | Stunts |
| Crew | Ted Barba | Stunts |
| Crew | Bobby Burns | Stunt Double |
