In scenes with the Baum family in 1899, the hardware on their front door is too modern.
The Witch's list of parallel worlds to conquer includes Wonderland, Neverland, Camelot, Shangri-La, and Narnia. But Camelot and Shangri-La are not parallel fantasy worlds, they are fictional cities in countries that exist on Earth. Camelot is in England, and Shangri-La is in Nepal.