Frenzy actual London serial murder cases: the Christie murders in the early 1950s, and the Jack the Ripper murders in 1888. Barry Foster has said that, in order to prepare for his role, he was asked by Hitchcock to study two books about Neville Heath, an English serial killer who would often pass himself off as an officer in the RAF. "Frenzy" was the third and final film that Hitchcock made in Britain after he moved to Hollywood in 1939. The other two were "Under Capricorn" in 1949 and "Stage Fright" in 1950 (although there were some interior and exterior scenes
The Man Who Knew Too Much (1956 film) not watch the early version nor read its script, with all the plot details coming from a briefing with Hitchcock. Only the opening scenes of the script were ready when filming begun, and Hayes had to send by airmail the subsequent script pages as he finished them. Hitchcock again brought James Stewart to be his protagonist as he was considering the actor a creative partner, and Paramount wanted a sense of continuity between his works. The director requested blonde Doris Day for the main female role as he liked her performance in "Storm Warning", though associate producer Herbert Coleman was