Character mistake: When Dorothy and the others enter the Haunted forest, the sign reads "Witches Castle One Mile." "Witches" is plural. To be grammatically correct, it should have said "Witch's Castle," if one witch, or "Witches' Castle" if more than one.
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Suggested correction: Not necessarily. There was a time when apostrophes were not consistently used to indicate possession, and even today, usage varies. In earlier periods, the apostrophe was used more sparingly, and there was less standardisation in its application. Today, apostrophes aren't used on street names (e.g. Queens Road) and many pub names (e.g. The Bulls Head), etc.