The last Hammer film to be made in black and white.
Bette Davis forced co-star Jill Bennett to walk behind her at the dog track one night because she thought she was underdressed.
According to writer Marcus Hearn in "The Hammer Vault", Davis unsuccessfully tried to seduce producer Jimmy Sangster.
In his 1990 book "Fasten Your Seatbelts", Lawrence J. Quirk quotes from his interview with Seth Holt regarding working with Bette Davis: "Oh it was hell! Then she was always telling me how to direct. When I did it her way, she was scornful; when I stood up to her she was hysterical. I managed some kind of middle course and got through the film and stayed calm". Once telling her she was overacting, she retorted: "I act larger than life! That's what my audience paid me for all these years. If they wanted ordinary reality they'd go out and talk with their grocer!".
Bette Davis's daughter Barbara Merrill felt that there was more to her mother's production delaying 'flu. Costume designer Rosemary Burrows had proposed lightweight, cotton dresses as worn by modern nannies, whereas Davis wanted a traditional, old-fashioned wool uniform with white collar which were by then very difficult to find. Davis was able to leave her hotel room once one was located, just as her daughter predicted.