In addition to his credited work as make-up artist, Charles Gemora also designed and sculpted the shrunken heads.
United Artists released this as the bottom of a double bill with "Invisible Invaders" (1959). Both films were directed by Edward L. Cahn, and despite each film listing a different production company, Premium Pictures and Vogue Pictures, both were actually produced by the same company.
The script is based in part on the Amazonian Indian practice of removing the skulls from decapitated heads, padding them with hot sand and shrinking them to an extremely small size.