This is the only film in which veteran horror stars Vincent Price, Christopher Lee, Peter Cushing and John Carradine all appear.
John Carradine fell asleep filming a major dinner scene and was in the land of nod for much of the scene.
This movie ran out of money three weeks into shooting.
Vincent Price was born on May 27, 1911, making him exactly eleven years older than Sir Christopher Lee, who was born on the same date in 1922. Peter Cushing missed by only one day of making it a triple, as he was born on May 26, 1913.