After Les plaisirs de Pénélope (1966), Natalie Wood bought herself out of her Warner Bros. contract for $175,000 and fired her staff of agents, managers and lawyers. She didn't make another film for three years.
Sir Dirk Bogarde turned down the role ultimately played by Ian Bannen. Bogarde opted instead to star in Joseph Losey's Accident (1967) written by Harold Pinter, the last of his five collaborations with Losey.
Second consecutive film starring both Natalie Wood and Peter Falk, following La Grande Course autour du monde (1965).
The copy of Life magazine Dr. Gregory Mannix has in his office is the May 6, 1966 issue with Jacqueline Kennedy Onassis riding a white horse in Spain on the cover.
There seems to be a scene cut from the movie, perhaps a fantasy sequence. Some lobby cards show Natalie Wood and her husband in the film in their beds. The husband looks bored and uninterested in Natalie. In others from the same scene, he reads a newspaper or has a boardroom meeting while Natalie sits in bed looking gorgeous.