The set used as Caswell's executive office was the same one used as that of Anne Welles' boss Mr. Bellamy in La valle delle bambole (1967).
Michael Sarrazin and Jacqueline Bisset began dating during filming. They split in 1973 after six years together.
Jacqueline Bisset hated her nude scene in the ocean. "I was supposed to hold my arms over my chest, but it was all I could do to stand up as the cold waves hit me. Finally I was knocked down and I even lost the bottom part of my bikini. Oh. it was miserable!" - she said.