James Mason met his future wife Clarissa Kaye-Mason on the set of this movie. Clarissa Kaye played the part of Mason's ex-girlfriend in Australia. Their scene together was filmed in bed, and Clarissa, who was recovering from pneumonia, had a temperature of one hundred three degrees Fahrenheit (39.4 degrees Celsius). After filming, Mason began corresponding with Kaye, and the two were married in 1971, and remained so until Mason's death in 1984.
The closing credits under Dame Helen Mirren's cast billing specifically and unusually notate that "Miss Mirren is a member of the Royal Shakespeare Company (R.S.C.)". Up until that time, Mirren had portrayed supporting roles in three theatrical movies, one uncredited, Herostratus (1967), and one for the R.S.C., Le songe d'une nuit d'été (1968).