With Wicked now in theaters, the adaptation of the Broadway musical — which itself is an adaptation of Gregory Maguire’s novel — has sparked a renewed interested in all things Wizard of Oz. Not only has there been an uptick in sales of copies of Maguire’s book (and a prequel novel,

Wicked movie director Jon M Chu has explained why some elements of The Wizard of Oz prequel don't match up. The film tells the story of how multiple characters from Dorothy Gale's iconic adventure in Oz came to be the way they are, but for those whose only reference point is the 1939 film, some things don't make sense.

With "Wicked" the movie being an adaptation of the stage musical which is an adaptation of the book, things get confusing. Here's what to know.