Mario Bava's son Lamberto Bava was an assistant director on the film, and recalled that Lucisano called his father to do some work on the film, such as matte paintings. Lamberto also noted that he and his father often laughed between themselves at Román's directorial style, as he would always use the first take of each scene. Lamberto Bava's recollections of Román's working methods would have resulted in Lucisano getting Bava to direct. Lucas also notes that Lamberto Bava would not have served as an assistant director if the film had been entirely shot in Spain.
