Laurence Olivier had already been contracted whenever Marilyn Monroe came on board. Contractually she was unable to remove him.
Laurence Olivier had already played the part of the Prince Regent on the London stage, alongside his wife Vivien Leigh.
Laurence Olivier was reputedly so driven mad by Marilyn Monroe's difficult behaviour that he practically abandoned directing for the screen, only returning in 1970 to make Three Sisters.
Marilyn Monroe reportedly received 75% of the film's profits, such was the deal set up with her own production company.
The film was originally planned as a musical until Marilyn Monroe's then husband, Arthur Miller, persuaded her to drop the songs.
The first film from Marilyn Monroe's own production company.
The only film Marilyn Monroe made outside of the American continent.
Three or four different copies of Marilyn Monroe's white dress were made to accommodate her fluctuating size. At the time she was suffering from various illnesses which caused severe amounts of water retention. She also suffered a miscarriage during filming.
Writer Terence Rattigan had initially expressed doubts about an actor of Laurence Olivier's stature playing such a mundane character. His doubts were allayed when he saw Olivier play the part on stage.