The Little Shop of Horrors recalled "at first they told me it was a detective movie; then, while I was flying back [to make the movie], I think they wrote a whole new movie, more in the horror genre. I think over a weekend they rewrote it." The screenplay was written under the title "The Passionate People Eater". Welles stated, "The reason that "The Little Shop of Horrors" worked is because it was a love project. It was "our" love project." The film was partially cast with stock actors that Corman had used in previous films. Writer Charles B. Griffith portrays several small roles. Griffith's
Little Shop of Horrors (film) Muppets Take Manhattan" around the same time. Oz initially rejected it, but he later had an idea that got him into the cinematic aspect of the project, which he did not figure out before. Oz spent a month and a half to restructure the script which he felt was stage-bound. Geffen and Ashman liked what he had written and decided to go with what he did. Oz was also studying the Off-Broadway show and how it was thematically constructed, all in order to reconstruct it for a feature film. The film differs only slightly from the stage play. The title