Well, the biggest difference between the book and the film besides the color of the slippers is that in the book, Oz isn’t a dream. The shoes take her to the field outside her home, and that’s where her family finds her. The shoes fall off en route. Another difference is that in the book there are *two* good witches just as there are two bad- the Good Witch of the North and Glinda who is actually the Good Witch of the South if I remember correctly. Other differences are a sequence involving a town made of china and that it’s mice who rescue them from the poison of the poppies. I’m sure there are others, but it’s been years since I read the book.