Jack Nicholson always gave high praise to everyone he worked with on the set, except one - the Raven. He said the Raven pooped on everyone, but especially liked to poop on him; he later said: "I would look down when the Raven flew off my shoulder, and it would be covered in poop....I hated that bird."
In casting his spells, Dr. Bedlo uses several Latin phrases: Veni vidi vici: I came, I saw, I conquered. De mortuis nil nisi bonum: Do not speak ill of the dead. Cave canem: Beware of the dog. Si vis pacem parabellum: If you want peace, prepare for war. Ceterum censio Carthaginem esse delendam: Furthermore, I believe that Carthage must be destroyed.
The events in the film take place circa 1506 based on two clues offered early on. Dr. Craven states that his father has been dead 20 years, and when they show the plate on the coffin the date of death is given as 1486. Therefore, 1486 + 20 = 1506.