When Joan copies the Lord's Prayer backwards from the Bible, it is the King James version, even though she and her husband are Catholic. While any Catholic owning a Bible in that era (not a very common occurrence apart from scholars) would have a Douay version, the elaborate, antique nature of the book suggests it may have been one of her recent purchases at the antique store where she bought the rest of her witchcraft paraphernalia.
The name on the MasterCharge card Joan uses to buy her witchcraft supplies is "George A Romero".