Mario Bava
In Tim Lucas' book "Mario Bava, All the Colours of the Dark", an interview with Luciano Pigozzi states that Mario Bava created a special effect for the film involving a large sailing ship. There is no scene in the film involving boats and Lucas has assumed that this effect would show up when the film was shown at its proper aspect ratio or that the scene had been cut. Muller had later noted that he did not recall seeing Mario Bava on the set ever.