Avoid The Dreaded R Rating: The movie was shot for an R rating. However, after the studio saw that recent PG-13 horror films were making big buck (such as The Ring), they asked for language and some violence to be edited down to compete.
Breakaway Pop Hit: Michael Jackson's performance of "Ben" (which was written for the original movie's 1973 sequel) is probably more popular than either the book or the two movies.
Keep Circulating the Tapes: The book is out of print (though it can be found on amazon, the copies are often in horrible condition) and the 1971 movie is only on VHS.
The book was finally reprinted by Valacount Books in 2013.
Too Soon: Arguably an inversion. Robert Bloch wrote Psycho when the Ed Gein case was still fresh in the public's mind. For whatever reason, Gilbert waited 8 years. Each book was adapted to film, and each film had a remake, but Bloch's yarn is definitely more well-known. If there was ever a case against tactfulness, this would be it.