The first sequel to Jaws, released in the year 1978.Four years after the events of the first film, another shark swims to the Amity Island waters to munch on its inhabitants. Sheriff Brody desperately seeks to find a way to stop it, especially when it makes the annual regatta which his sons are attending as its primary target.
Callback: A subtle one - the barrels that Brody and Hooper swam back into shore on in the first movie? One of them is now a planter outside of the Brody home.
The Cavalry: Subverted twice. After the shark attacks the teenagers and sends them adrift on a raft cobbled together of what's left of their sailboats, help arrives on two occasions, but they each fail in different ways.
A helicopter (the type that can land on water) arrives to tow the boats. The shark attacks the helicopter, eats the pilot, and the mayhem causes the rafts to collapse, leaving almost nothing left for the teenagers to stay afloat on.
Chief Brody later comes to the rescue. The shark attacks his boat as well, causing him to steer and crash it into the tiny island that was close by. As a result he has to find other means to save them.
Chekhov's Classroom: Dr. Elkins' info dump on sharks' ability to detect sound comes in handy for the climax.
Chekhov's Gun: The police boat's dredging hooks snagging the power cable...
Flare Gun: Shooting with it when everything is soaked by gasoline proves to be an unpleasant mix.
Fleeting Demographic Rule: In-universe example. Chief Brody is convinced a series of mysterious deaths and disappearances at sea are the work of another shark. Despite the events of four years before, and Brody presenting the selectmen with photographic evidence of the shark, they and the mayor fire him for his "paranoia" (and for panicking beachgoers by firing his weapon at a school of bluefish). And like true Bats, they keep the beaches open once again.
Well, to be fair, all Brody showed them was a really bad close-up photo of the shark, to where you could BARELY see anything. Brody doesn't help his case by acting like a crazily obsessed man during the whole scene, showing absolutely no remorse for his actions on the beach, which could have resulted in someone being injured or even killed—the committee was well within its right to fire him over that.
Foreshadowing: It is foreshadowed on two seperate occasions how the shark is killed in the end. The marine biologist investigating the orca carcass caused by the shark mentions how sharks are attracted to rhythmic underwater sounds. When Brody's deputy and another assistant are searching for bodies on the sea floor, they find an electrical cable, and quickly drop it back to the bottom. At the end, Brody finds another electrical cable, and attracts the shark by bashing the cable with a bat, causing the sounds. The shark bites the cable, and gets electrocuted.
Hazardous Water: A victim is two feet from a boat, but gets eaten before she can get pulled up, despite having several seconds beforehand.
Hope Spot: The helicopter, which arrives to help the stranded kids. Then the shark appears and capsizes it.
Hysterical Woman: After the shark attacks them, one of the female teenagers eventually goes hysterical, screaming like crazy and having a panic attack when their rafts get stuck at the bottom. Another one tries to shut her up by shaking her violently, but is told by his friends that this won't help. Not all the women are like this, but it stands out because by contrast the guys are all portrayed as practical and goal-oriented, and none of them breaks down to the same degree. Even the much younger Michael holds it together better than her, who by all accounts has far more right to be freaked out due to being a kid. In her defense, she is in the middle of an extremely traumatic and terrifying experience, as well as having seen friends die in front of her.
Ignored Expert: Brody this time around. Although, unlike Hooper, Brody really doesn't help himself due to his reckless actions on the beach.
Roaring Rampage of Revenge: Martin wonders if this is the case - with the second shark seeking to avenge the first one. This is quickly dismissed, though, and not mentioned afterwards.
Sadistic Choice: Featured in a Deleted Scene that's an extra on the DVD and edited into some TV airings. After the helicopter is pulled underwater, the pilot struggles to escape, only to see the shark waiting for him. Drown or get eaten? Of course, the shark soon saves him the trouble of choosing.
Shock and Awe: Brody kills the shark by duping it into biting an electrical cable. The shark is electrocuted, and bursts into flames.
Synchronized Swarming: A possible example: Brody is alarmed by a shape in the water. It turns out to be a school of fish, and the shark is elsewhere. It is not clear to the audience exactly how similar the shape was to a shark.
Threatening Shark: The primary antagonists of the films, specifically very large great whites.
Ultimate Job Security: It rather strains belief that Vaughn wouldn't be booted out of office within seconds of the first film's ending.
You Have to Believe Me: Brody has the nerve to be indignant about no one believing him after he causes a mass panic over what turns out to be a school of bluefish. After this, he brings a photo to the council that we know is of the shark, but is unclear enough that you really can't blame them for not buying it. He could have at least waited to see if there were any better shots.