"Black Sabbath" was made at the end of production of "The Girl Who Knew Too Much" during an eight-week period between February and March 1963. American International's involvement with the film allowed Salvatore Billitteri of Titra Sound Corporation to be on set to supervise the film for dubbing on its English-language release. As the film was going to be dubbed in different languages, actors could no longer phonetically pronounce their dialogue as it had to be done rhythmically to match various languages. Billitteri was also on set to give suggestions to Bava on how to make his film more appropriate for American audiences, which led to decreasing the amount of violence in the film. The film was first conceived under the title "The Fear".