for his performance in Duddy Kravitz. Editor Verna Fields rarely had material to work with during principal photography, as according to Spielberg "we would shoot five scenes in a good day, three in an average day, and none in a bad day." The delays proved beneficial in some regards. The script was refined during production, and the unreliable mechanical sharks forced Spielberg to shoot many scenes so that the shark was only hinted at. For example, for much of the shark hunt, its location is indicated by the floating yellow barrels. The opening had the shark devouring Chrissie, but it was rewritten so that it would be shot with Backlinie being dragged and yanked by cables to simulate an attack. Spielberg also included multiple shots of just the dorsal fin. This forced restraint is widely thought to have added to the film's suspense. As Spielberg put it years later, "The film went from a Japanese Saturday matinee horror flick to more of a Hitchcock, the less-you-see-the-more-you-get thriller." In another interview, he similarly declared, "The shark not working was a godsend. It made me become more like Alfred Hitchcock than like Ray Harryhausen." The acting became crucial for making audiences believe in such a big shark: "The more fake the shark looked in the water, the more my anxiety told me to heighten the naturalism of the performances." Footage of real sharks was shot by Ron and Valerie Taylor in the waters off Dangerous Reef in South Australia, with a short actor in a miniature shark cage to create the illusion that the sharks were enormous. During the Taylors' shoot, a great white attacked the boat and cage. The footage of the cage attack was so stunning that Spielberg was eager to incorporate it in the film. No one had been in the cage at the time and the script, following the novel, originally had the shark killing Hooper in it. The storyline was consequently altered to have Hooper escape from the cage, which allowed the footage to be used. As production executive Bill Gilmore put it, "The shark down in Australia rewrote the script and saved Dreyfuss's character." Although principal photography was scheduled to take 55 days, it did not wrap until October 6, 1974, after 159 days. Spielberg, reflecting on the protracted shoot, stated, "I thought my career as a filmmaker was over. I heard rumors ... that I