The film is in public domain in the United States.
On most of the interior shots, the coldness of the air can be seen by the breath of the actors.
Long after its release, director Alberto de Martino described his film as "a little film of no importance"
The film's script by Gianni Grimaldi and Bruno Corbucci is promoted as being based on the works of Edgar Allan Poe, but actually only borrows elements from the stories "The Fall of the House of Usher", "A Tale of the Ragged Mountains" and "Some Words with a Mummy"
Spanish sources for the production credit Natividad Zaro as a contributor to the script. As with many European co-productions of the era, this was done for tax reasons.