M
marlboro
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That's because the novel was actually released before the film. The hardcover edition came out in March '66, then the film was released in late August and the paperback came out in September to cross-promote with it. It's hard to believe in these spoiler-phobic times, but a lot of movie novelizations used to be released ahead of time to build interest for the film. After all, many films were adaptations of novels, so having prior knowledge of a story from a book was seen as something that would create more interest in a film, not "spoil" it as we assume today.
Another thing that's worth noting, is the scarcity of multiplex theaters outside of large cities in America in the past. I live in a rural area, and pre 1980 you would be hard pressed to find a theater with more than one screen. That theater might be the only one among a handful of counties. So, if you wanted to see something that wasn't a #1 hit you were likely SOL.
What every little town did have though was a drugstore or a 5 and dime that might carry a selection of paperback books. The novelization might be as close to seeing some of these movies until the rise of the mom and pop video stores.
One other thing: before The Godfather and Jaws most movies were released via slow rollout, I believe. You start in big cities to test the waters and move out from there. So, if you're in Topeka and are looking forward to a new movie, but it bombs in NY or LA you will probably have to cross your fingers and hope that it gets shown on tv in a few years. Or you could read the novel version.