The movie L.A. Confidential had deviated from the book in many aspects, primarily because the book was so sprawlingly huge that a great deal of the meat had to be cut down to the bare bone. And because so much had been cut away, some new story lines had to be created by the screen writers in the movie to make up for said lost material. But that said, the movie actually had worked out pretty well, and was still a pretty decent adaption, that even the novel's author, James Elroy, had liked.
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-Bill, otherwise known as Kraichgauer