Wow, I have never been so satisfied, much less not disappointed by a potter film until tonight. The attention to canon was beautiful. The ministry scene in particular was literally straight out of my imagination as I was reading the book.
All the essentials were there, and I thought the extra scenes and dialogue really complemented (instead of ruining) the book. In every film there's always been something in particular they've really fucked up, but none come to mind. And even in areas where they've stuck to the books they've often done a poor job of making an interesting film of it. But had I had no familiarity with the series, I think I would still love this movie. 7 tries and finally they've got it right (though in all fairness, Chris Columbus's early films were done very well).