Rochester Castle, built by the "crazy" heiress Priscilla Rochester, is a clear reference to the Winchester House in San Jose, CA. Sarah Winchester was the main heir to the Winchester Repeating Arms fortune. She continuously built onto her house until her death, rumor had it to pacify the spirits of people killed by Winchester guns.
This was the second of three pictures director Maury Dexter filmed at the Greystone Mansion, in between The Day Mars Invaded Earth (1962) and Maryjane (1968).
The Campbells' California license plate reads Y61 406.
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