If you missed the first one of these, the Concept is simple: comparing the Book version of a Story to the film one. This is a doozy!
In 'Psycho 2' (the book), Norman escapes the Asylum by killing a Nun and flees to...Hollywood! No Bates Motel- just a set later. Symbolism?
In the book, the sister of Marion Crane is killed about 10 Chapters in. 31 year-old SPOILER btw.
In the Book, Norman is not the real killer...but 2 others are. Limited SPOILER.