In no particular order... (3 & 4)
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EEEEK!!!!

Thanks to Castle's gimmickry, the film was a huge success.Alfred Hitchcock took notice of the low-budget film's performance at the box office, and set out to make his own low-budget horror film, which became the critically acclaimed hit Psycho (1960). Castle was himself a Hitchcock fan, and would try to imitate Hitchcock's work in later films. (from Wikipedia)