Trivia: Alfred Hitchcock chose Raymond Burr to portray the villainous Lars Thorwald due to his resemblance of David O. Selznick, a producer Hitchcock hated.
Trivia: Alfred Hitchcock wanted the film to look as natural as possible, with the camera at eye level with the actors. Since movie cameras were large (especially 3D cameras), Hitch had a small trench built into the soundstage floor, so that the camera lens was, roughly, at eye level.
Trivia: During the McCarthy Red Scare, director Elia Kazan decided to name suspected Communists in Hollywood and was severely criticized for doing so. It's widely believed this film was his attempt at vindication by portraying Terry Malloy as a hero who testifies in court against his friends.