
I've watched Psycho 3 numerous times ever since as a kid I ordered on pay per view cable without my parents' permission. But as usual, it takes several views before you pick up on hidden meanings within the film.
Like a seemingly harmless shot of a book on the ground in one of the early sequences right before we see some birds poisoned (because Norman likes to stuff them). I never paid attention to it before but this time I rewound the DVD and paused it. The title is: "The Belly of the Beast."
Admittedly, I never heard of it before so I looked it up on Google. Yes, it's an actual book written by a murderer by the name of Jack Abbott. According to Wiki, "Jack Abbott was an American career criminal and the book consists of his letters to Norman Mailer about his experiences in what Abbott saw as a brutal and unjust prison system. Mailer supportedJack Abbott was an American career criminal and the book consists of his letters to Norman Mailer about his experiences in what Abbott saw as a brutal and unjust prison system. Mailer supported Abbott's successful bid for parole in 1981, the year that In the Belly of the Beast was published."
And so when Jack Abbott was released his book was published and was a hit. Only, Abbott murdered a waiter one day before the book was released, thus proving, despite the cruel conditions of the prison system, maybe he belonged in it.
I'm not sure that's what Psycho 3 is implying but it's one hell of a foreshadowing clue as to the nature of Norman Bates.