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) who turned it down. Barbra Streisand was also rumored to have been offered the part. Since Greene was the original off-Broadway Audrey, the role was given to her. "She's amazing," Oz said. "I couldn't imagine any other Audrey, really. She nailed that part for years off-Broadway." The character of the masochistic dental patient, Arthur Denton, played in the original film by Jack Nicholson under the name "Wilbur Force", and cut from the stage version, was added back to the story and played by Bill Murray, who improvised all of his dialogue. It supposedly took Steve Martin six weeks to film