Of all the Potter films, this is the most faithful adaptation to date. We saw the movie twice (midnight release, and again last evening). Sure, there were details that were slightly changed (locations of conversations to be specific), but these were minor supporting details. In a book, the author must reveal every detail very specifically so we can visualize them. These details were presented in "flashes" in the background. Pay attention to the pictures in the background of the movie, and I think you'll find they left very little out. We'll go see it again in IMAX in a couple of weeks. It's the first Potter film I'll have seen more than twice in the theater.