- Considered for the role of Marion were: Eva Marie Saint, Piper Laurie, Martha Hyer, Hope Lange, Shirley Jones, and Lana Turner.
- Hitchcock bought the rights to the novel anonymously from Bloch for just $9,000. He then bought up as many copies of the novel as he could to keep the ending a secret.
- Filmed in black and white because Alfred Hitchcock believed the movie would be too gory for color.
- During filming, this movie was referred to as "Production 9401" or "Wimpy".
- Hitchcock paid the title sequence designer Saul Bass (also credited as "Pictorial Consultant") $2,000 to render storyboards for the scene where Arbogast is killed at the stairs. Brass was excited about the movie and asked Hitch for the opportunity. Hitchcock discarded his work because the shots showed Arbogast's feet slowly going up the stairs and this prepared the audience for a shock. Hitch wanted it to be a surprise and that's why he filmed Arbogast in a completely natural way.
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