The episode title "The King Came Calling," is not spoken by any of the characters. This is the only episode in which the title is neither spoken nor written by a character.
Ergotism was used in many of the ancient sacrifices of bog bodies in the ancient British Isles.
In the Middle Ages, ergotism was known as "holy fire" or "Saint Anthony's fire", because monks of the Order of St. Anthony who were particularly successful at treating this gangrenous poisoning.