Christopher Lee (Dr. Fu Manchu), Tsai Chin (Lin Tang) and Howard Marion-Crawford (Dr. Petrie) are the only actors to appear in all five "Fu Manchu" films.
Shirley Eaton only has two lines.
Filmed back-to-back with the next chapter in the franchise, "Die Folterkammer des Dr. Fu Man Chu (1969)."
The cast and film crew began to secretly despair of Jesus Franco's notoriety for filming the production with little money at hand.