Hitchcock was creating suspense when shooting the film. He asked all production staff to take an oath to keep the plot and the ending of the story strictly confidential. In addition, he also announced the candidate list of Norman Bates's mother, but in fact there is no mother role in the script.
When shooting the film, Hitchcock used Janet Leigh as a test object in order to test whether the dead bodies in the play were scary enough. Janet Lee pushes the door into the dressing room after lunch, and finds a "zombie" sitting in her chair, and Hitchcock will also base on the level of fear that Janet Lee screams every time. Decide which dummy to use as a "zombie".
When shooting the film, Hitchcock gave up the idea of using color film in order to avoid excessively stimulating the audience after the film was released, and switched to black and white film.
When filming the scene where the bathroom was killed, Hitchcock had no intention of using additional sound effects, but after listening to Bernard Herman's performance, he changed his mind.
The climax of the bathroom murder scene was only 45 seconds, but Hitchcock took 7 days to film the scene, with the camera shifting up to 60 times.
