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While the script for Jaws was heavily rewritten and shaped during production, there is one famously improvised moment that stands out, and it has become iconic.
It's important to note that while other minor adjustments and line readings likely occurred spontaneously during filming, they weren't typically as impactful or widely documented as Scheider's "bigger boat" line. The essence of other scenes remained largely true to the rewritten and evolving script.
This is one of the most famous behind-the-scenes stories of the film and a key character moment.
The summary incorrectly attributes the line to 'genuine surprise' rather than a calculated use of a set-wide joke.
This is another iconic line that was not in the script.
A minor but documented ad-lib where Shaw was told to simply 'annoy' the character.
While the 'You're gonna need a bigger boat' line is the most famous improvisation in Jaws (1975), it was not the only one. That specific line was an inside joke among the crew, who were frustrated by the small size of their support barge (nicknamed the 'S.S. Garage Sale'); Roy Scheider ad-libbed it in several takes before the iconic one was selected. Another major improvised scene is the dinner table moment where Chief Brody's son, Sean (Jay Mello), mimics his father's depressed gestures; Spielberg saw the actors doing this during a break and decided to film it. Additionally, Robert Shaw (Quint) ad-libbed the toast 'Here's to swimmin' with bow-legged women' and the 'Mary Lee' joke directed at Ellen Brody. While the USS Indianapolis speech is often associated with Shaw's brilliance, it was a synthesized rewrite of multiple drafts rather than a spontaneous on-camera ad-lib.