" It is interesting to what gets changed for a movie from a book, which is why I never read a book before I see the movie if I have the choice. I liked the book fine, but I don't think I have enough grasp of history to follow the political commentary I've been told is there. Instead I listened to the differences between the movie and book. Two very early interesting differences are the good witch of the north marks Dorothy on her forehead for protection and the famous ruby slippers are silver in the book. I suspect these are changes that made sense for how they looked on film, plus the mark of protection only seemed to help her once in the book. The change to ruby slippers, I very strongly suspect, were for the dramatic effect on the new color tech. Silver could easily look like her feet were still in black & white. I don't think this was bad since, no matter how much Dorothy professed the comfort of silver (I'm thinking they're metal, not colored. it is Oz after all) shoes, I ain't buyin' it. The movie also dropped about the last quarter of the book that explained the fates of all her companions, which was nice, but not necessary to know. Finally (mild spoiler here) the movie made it all a dream, whereas in the book she really did travel to Oz and return from there with the power of the slippers. "
— nooker, 1/31/2014