Monogram bought the story "Tiger Man"--which was originally supposed to be this film's title--from author Andrew Colvin, but when the title was changed to "Voodoo Man", Colvin wasn't given a screen credit.
The dialog at the gas station mentions "coupons". This refers to the gasoline rationing that was a normal part of American life during World War II, when this film was produced.
Shot in seven days beginning October 16 1943, the last of Bela Lugosi's nine Monogram features, but released four months prior to the eighth, Return of the Ape Man (1944).
Ralph addresses his producer as "S.K.". This is an in-joke reference to this film's real producer, Sam Katzman, uncle of Leonard, of Dallas (1978) fame.