Three girls are on a hitchhiking trip through northern Italy, the riviera, Venice, Pisa and Rome.
Unfortunately the movie It Happened in Rome is not yet available on HBO Max.
| Directing | Antonio Pietrangeli | Director |
| Sound | Luigi Puri | Sound |
| Sound | Mario Amari | Sound |
| Writing | Agenore Incrocci | Story |
| Directing | Gigliola Rosmino | Script Supervisor |
| Writing | Fabio Carpi | Idea |
| Camera | Luigi Filippo Carta | Camera Operator |
| Writing | Furio Scarpelli | Story |
| Writing | Nelo Risi | Idea |
| Writing | Dario Fo | Screenplay |
| Costume & Make-Up | Marilù Carteny | Costume Design |
| Sound | Lelio Luttazzi | Original Music Composer |
| Crew | Henry Cass | Dialogue Coach |
| Directing | Armando Crispino | First Assistant Director |
| Crew | Gisella Mathews | Dialogue Coach |
| Writing | Antonio Pietrangeli | Story |
| Directing | Dario Fo | First Assistant Director |
| Production | Pietro Bigerna | Production Manager |
| Production | Renato Jaboni | Production Secretary |
| Costume & Make-Up | Euclide Santoli | Makeup Artist |
| Production | Fulvio Tiberio Vergari | Unit Manager |
| Production | Giorgio Baldi | Production Secretary |
| Camera | Luciano Tonti | Camera Operator |
| Writing | Armando Crispino | Writer |
| Art | Nedo Azzini | Set Decoration |
| Writing | Furio Scarpelli | Screenplay |
| Editing | Eraldo Da Roma | Editor |
| Production | Ermanno Donati | Producer |
| Writing | Antonio Pietrangeli | Screenplay |
| Writing | Agenore Incrocci | Screenplay |
| Production | Luigi Carpentieri | Producer |
| Camera | Carlo Carlini | Director of Photography |
| Camera | Aldo Tonti | Director of Photography |