I have to agree with a Bill Simmons rant last week on his podcast--saying the book and the movie are different is just lame, as they are two different media. You cannot be in the heads of folks in the movies unless you get endless narration. Etc.
But this is still fun:
H/t To Buzz feed: http://www.buzzfeed.com/keenan/harry-potter-characters-in-the-books-vs-the-mov