I've found a continuity error in The Marvelous Land of Oz. In The Wonderful Wizard of Oz, Baum clearly states that no one in Oz had ever seen a dog before. In the sequel he must have forgotten this and placed a small dog running around Emerald City. Also, did Tin Woodman forget about the reason he wanted a heart? Instead of going to find his lost love he runs off to become Emperor of the Winkies.