Has the singular distinction of being the only theatrical film produced by Twentieth Century-Fox during the entire calendar year of 1970, this due to financial reversals incurred by the studio when several of its recent films failed at the box office.
Spurred by the phenomenal success of Rosemary's Baby (1968), Producer Quinn Martin paid over $250,000 for the rights to the novel on which this film is based.
At one point in the film, there is a reference to the "Curious Case of Benjamin Button", the short story by F. Scott Fitzgerald first published in 1922. When Myles is having his facial mask done by Paula, Duncan comes into the room and after a few moments says, "People should be born at seventy, and live their life backwards!" This is the exact age of Benjamin Button when he is "born" in the Fitzgerald story.
The exteriors of Duncan Ely's home were shot at 380 S.San Rafael Avenue, Pasadena (including a few night scenes) better known as Wayne Manor in Fox's 'Batman'.
Final film of Anabel Shaw.