Trivia

The "three witches" imagery is very prevalent throughout the world with versions appearing in numerous mythologies. The Fates of Greece, the Hecate, even the "Wyrd Sisters" from Shakespeare's Macbeth can be traced back to this idea of a trio of witches who either predict or influence the future.

One of the witches has the last name "Gray" a likely reference to the "Grae Ladies" from Greek mythology. In the myth of Perseus, they are depicted as impossibly old and sharing one eye and one tooth.