Lewis, a young amateur theater director, is offered a job with a governmental program for the rehabilitation of mentally ill patients in a Sydney institution. His project is overrun by one of the patients who wants to stage the opera Cosi Fan Tutte by Mozart despite the fact that none of the patients are able to sing and none of them speak Italian. A comedy of errors ensues, but one which unifies the patients and their director in unexpected ways.
Unfortunately the movie Cosi is not yet available on HBO Max.
| Directing | Mark Joffe | Director |
| Writing | Louis Nowra | Writer |
| Camera | Jasmine Yuen Carrucan | Assistant Camera |
| Camera | Kim Batterham | Camera Operator |
| Camera | Lester Bishop | Key Grip |
| Camera | Terry Cook | Assistant Grip |
| Camera | Sally Eccleston | Focus Puller |
| Camera | Bede Haines | Clapper Loader |
| Lighting | Matthew Hoile | Best Boy Electric |
| Camera | Philip le Masurier | Still Photographer |
| Camera | Calum McFarlane | Focus Puller |
| Lighting | John Morton | Gaffer |
| Lighting | Paul Selgren | Electrician |
| Camera | Alan York | First Assistant Camera |
| Crew | Billy Aziz | Special Effects Technician |
| Crew | Dan Oliver | Special Effects Technician |
| Crew | Glenn Boswell | Stunt Coordinator |
| Directing | Euan Keddie | First Assistant Director |
| Directing | Tony Gilbert | Second Assistant Director |
| Directing | Russell Boyd | Third Assistant Director |
| Production | Lynn Gailey | Associate Producer |
| Production | Phaedon Vass | Executive Producer |
| Production | Bob Weinstein | Executive Producer |
| Production | Harvey Weinstein | Executive Producer |
| Production | Richard Brennan | Producer |
| Production | Timothy White | Producer |
| Camera | Ellery Ryan | Director of Photography |
| Editing | Nicholas Beauman | Editor |
| Art | Hugh Bateup | Art Direction |
| Art | Chris Kennedy | Production Design |
| Art | Marita Mussett | Set Decoration |
| Sound | Stephen Endelman | Music |
| Costume & Make-Up | Tess Schofield | Costume Designer |
| Costume & Make-Up | Noriko Watanabe | Makeup Department Head |
| Production | Catherine Bishop | Production Manager |
| Crew | Peta Black | Scenic Artist |
| Sound | Wayne Pashley | Dialogue Editor |
| Sound | Andrew Plain | Supervising Sound Editor |
| Sound | Libby Villa | Dialogue Editor |
| Sound | Karin Whittington | Dialogue Editor |
| Visual Effects | Roger Cowland | Visual Effects |
| Visual Effects | Simon Carr | Digital Compositor |
| Costume & Make-Up | Mel Dykes | Costume Supervisor |
| Crew | Tony Lynch | Stunt Coordinator |
| Crew | Robin Gray | Score Engineer |
| Sound | Dan Lieberstein | Music Editor |
| Sound | Chris Gough | Music Producer |
| Sound | Christine Woodruff | Music Supervisor |
| Directing | Jo Weeks | Script Supervisor |
| Production | Jacinta Hayne | Production Coordinator |