Directed by: Jeannot Szwarc
Starring: Roy Scheider, Murray Hamilton, Lorraine Gary, Joseph Mascolo
Other mistake: When the shark grabs and eats Marge, there is no blood at all.
Other mistake: The dead Killer Whale washed up by the lighthouse was visible from the teens AND in their line of sight while they sat on the shipwrecked boat, also their Catamarans they pulled onto the sand were literally 100 feet away - as seen in the wide shot, but yet it was a surprise when Tina and Eddie come upon it. There's no wrack line showing in the sand so the whale didn't "just wash up "
Continuity mistake: When the kids are drifting around, a heavy rain shower comes. Seconds later, in the shot of Sean on the upside-down sail boat, you see reflections of sunlight and a large part of the boat he is sitting on is completely dry.
Martin Brody: I think we've got another shark problem.
Mayor Larry Vaughn: Are you serious?
Martin Brody: You bet I'm serious.
Trivia: During the filming, Roy Scheider didn't get along with director Jeannot Szwarc, and the two clashed frequently on set.