| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alessandro Alberti | Crew | Art | Assistant Art Director |
Amato Garbini | Crew | Costume & Make-Up | Makeup Artist |
Angelo Binarelli | Crew | Production | Unit Manager |
Ben Jonson | Crew | Writing | Theatre Play |
Boris Juraga | Crew | Art | Art Direction |
Charles K. Feldman | Crew | Production | Executive Producer, Presenter |
Cloudia Rebar | Crew | Crew | Scenic Artist |
David Bretherton | Crew | Editing | Editor |
David Hildyard | Crew | Sound | Sound Recordist |
Eric Stacey | Crew | Production | Associate Producer |
Frederick Knott | Crew | Writing | Theatre Play |
Giancarlo Del Brocco | Crew | Costume & Make-Up | Key Makeup Artist |
 Gianni Di Venanzo | Crew | Camera | Director of Photography |
 John Addison | Crew | Sound | Original Music Composer, Conductor |
 Joseph L. Mankiewicz | Crew | Writing | Screenplay, Director |
Ken Muggleston | Crew | Art | Set Dresser |
Len Shilton | Crew | Sound | Sound Recordist |
 Pasqualino De Santis | Crew | Camera | Assistant Camera |
Paul S. Fox | Crew | Art | Set Decoration, Set Dresser |
Rolf Gerard | Crew | Costume & Make-Up | Costume Design |
Thomas Sterling | Crew | Writing | Novel |
Yvonne Axeworthy | Crew | Directing | Continuity |
John DeCuir | Crew | Art | Production Design |
Jim Groom | Crew | Sound | Sound Editor |
Peter Elliott | Crew | Editing | First Assistant Editor |
Gus Agosti | Crew | Directing | Assistant Director |
Lee Theodore | Crew | Crew | Choreographer |
Franco Cirino | Crew | Directing | Second Assistant Director |
Attilio D'Onofrio | Crew | Production | Associate Producer |
Gabriella Borzini | Crew | Costume & Make-Up | Hairdresser |
Thomas Sterling | Crew | Writing | Novel |
 Adolfo Celi | Cast | Actor | Inspector Rizzi |
 Capucine | Cast | Actress | Princess Dominique |
 Cliff Robertson | Cast | Actor | William McFly |
 Edie Adams | Cast | Actress | Merle McGill |
 Herschel Bernardi | Cast | Actor | Oscar Ludwig (uncredited) (scenes deleted) |
 Hugh Manning | Cast | Actor | Volpone |
 Jack Benny | Cast | Actor | Violinist Outside Restaurant (uncredited) |
 Maggie Smith | Cast | Actress | Sarah Watkins |
 Massimo Serato | Cast | Actor | The Pretender (uncredited) (scenes deleted) |
 Mimmo Poli | Cast | Actor | Cook (uncredited) |
 Rex Harrison | Cast | Actor | Cecil Fox |
 Susan Hayward | Cast | Actress | Mrs. Sheridan |
David Dodimead | Cast | Mosca | |
 Luigi Scavran | Cast | Massimo (uncredited) | |
| Person | Type | Job | Role(s) |
