Richard Fleischer was originally hired to direct the picture. He accepted, but when he asked to see the script he was informed that one hadn't been written yet. Also, after talking with Capucine, he thought she was all wrong for the role of the prostitute - he didn't think she was sexy or earthy enough to convince anyone that she was a hooker, and he informed producer Charles K. Feldman of his conclusion and asked that she be replaced. Unfortunately for Fleischer, Feldman and Capucine were living together at the time, and he had already promised her the role. So Capucine got the part and Fleischer got the boot. He was replaced by Henry Hathaway.
The creek where the cabin is located is also the the same spot used in True Grit (where Dennis Hopper's character and his brother are killed) and in Nevada Smith (where Steve McQueen's character first meets Brian Keith's character).
Years after the production was first shown in public, the producers of the film admitted that, in the scene where Capucine is trying to laugh, she was actually tickled on her feet and that her laughs and pleas for mercy were entirely genuine.