Without the film structured the way it is, it would not be as great nor would it have been as successful. Part of its popularity came about in the way that Hitchcock marketed it. Theaters showing Psycho were under strict instructions not to allow latecomers, despite the fact that it was previously common for moviegoers to enter a picture halfway in, then stay and watch the beginning afterward. It was a rare film of Hitchcock's to be so contingent on a surprise.
Surprisingly, Stefano was not nominated for the Adapted Screenplay Oscar in 1961, even though the film was recognized in other categories. There are not many adaptations that improve on their source material as well as Psycho, nor are there many that exhibit such good judgment on the use of creative license. Stefano never wrote another hit film, turning down The Birds and Marnie in favor of working on the TV show The Outer Limits. He did eventually revisit his most successful character, though, writing the screenplay for the TV prequel Psycho IV: The Beginning, which featured E.T.'s Henry Thomas as a young Norman.