In the movie Jaws, during the night/early morning scene where Hooper, Quint and Chief Brody encounter the great white shark (when the shark begins pounding on the boat), just after the shark goes away there's a shooting star in the corner of the scene, and it's shown twice.
What was the significance of this "shooting star"?
There was actually no significance to the shooting star in the movie. It was just a happy accident that was captured on film according to the 1995 documentary The Making of Steven Spielberg's Jaws. This site explains it in more detail:
Ironically, Spielberg’s first cinematic shooting star occurred accidentally rather than by design. In the final act of Jaws, a shooting star can be seen during one of the night sequences, when Brody is loading his gun. However, this wasn’t a special effect. According to the 1995 documentary ‘The Making of Steven Spielberg’s 'Jaws’’, the shooting star occurred naturally, and Spielberg and his crew just happened to be in the right place at the right time to capture it.
Apparently, this happy accident turned into somewhat of a theme in future Spielberg movies involving shooting stars:
A happy accident it may have been, but it sparked off a reoccurring theme. Along with Close Encounters and Jaws, shooting stars can also be seen in Indiana Jones and the Temple of Doom and The Adventures of Tintin: The Secret of the Unicorn. Some have also suggested they’re visible in Hook and Saving Private Ryan, but so far I haven’t been able to find any clear-cut evidence for either.
