Just like the title says. This guy (read: hardcore LOTR purist) spent God knows how long listing all the deviations between the movies and the books. The books are good, but there's a lot that would have sucked if it was in the movie, Tom Bombadil being a prime example. Not to mention, the sheer impossibility of translating the complete books into a format not exceeding 3 1/2 hours.
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