9. The U.S.S. Indianapolis Speech
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You may remember the story told by Quint regarding his time spent on the U.S.S. Indianapolis. It was definitely a memorable moment in the film. But it turns out that it wasn’t part of the original script, nor was it part of the book. Instead, it showed up in an uncredited rewrite of the script by the playwright, Howard Sackler. Writer-director John Milius later expanded upon the idea and turned it into a multi-page monologue. When it came time to shoot the scene, Robert Shaw ended up sprucing it up a bit seeing as how he was also a playwright and understood the process.