According to Alexander Walker in 'Sex in the Movies', Marlene Dietrich turned down the film "on the grounds that she could never be convincing as a woman who tries to gas herself because she cannot keep her lover or find other men."
Kenneth More says in his autobiography "More or Less", that he was against Vivien Leigh as his co star in the film. Leigh was aware of this and he says that did not help the chemistry between the two of them. (More would have preferred Peggy Ashcroft with whom he had appeared in the original play).
Probably unreleased in France; The date (6-1-1956) provided by Encyclo-Ciné must be the press screening date.
Re-made in 2011 with Rachel Weisz and Tom Hiddleston.