The mentally challenged patient who is strapped to the table is not an actor in makeup but a genuine microcephalic who was a veteran of circus sideshows who appeared under the name of "Schlitze". Although he was a male, this film was one of the rare times he appeared as a male; he was normally dressed and exhibited as a female.
The priest who discovers the truth about Alice's true bloodline is played by director Crane Wilbur, who also co-wrote the screenplay.