Little Shop of Horrors (film) would pantomime and lip sync in slow motion. The film was then sped up to the normal 24 frames per second and voices were reinserted in post-production. Levi Stubbs' recordings were run through a harmonizer when slowed down so that they were coherent for Moranis or Ellen Greene. There are no blue screens or opticals involved in any of Audrey II's scenes, with the exception of the reshot ending where the plant is electrocuted, designed by Visual Effects supervisor Bran Ferren, and in some shots during the rampage in the original ending. The plant was made in six different stages
The Little Shop of Horrors was called upon to write music for Corman, Katz sold the same score as if it were new music. The score was used in a total of seven films, including "The Wasp Woman" and "Creature from the Haunted Sea". Katz explained that his music for the film was created by a music editor piecing together selections from other soundtracks that he had produced for Corman. Howard R. Cohen learned from Charles B. Griffith that when the film was being edited, "there was a point where two scenes would not cut together. It was just a visual jolt, and it didn't