The Deep (1977)

Continuity mistake: In the opening scenes, when David is chiding Gail for grabbing him through the porthole of the wreck, his right hand is gloved, then ungloved, then regloved..all in the space of a few moments.

Continuity mistake: When Treece's air line gets caught up with sharks and he is dragged out of the wreck, the only thing to hold onto is a metal bar that is attached to a metal plate, but when David and Gail arrive with the suction device, suddenly there is a whole lot more going on on the sea floor, including a perfect hole to put the suction tube in, so they can turn it on and, after cutting David's and Treece's air lines, they can rise to the surface, hidden from the sharks by all the air and rubbish from the suction tube.

kh1616

Plot hole: If the vacuum is strong enough to suck up a hand grenade, why isn't it sucking up the ampules?

Trivia: Author Peter Benchley has a cameo as a U-boat crewman in the prologue (extended version).

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Henri Cloche: If his tongue moves again, cut it.

Romer Treece: Hey, boy, this is "Goliath" trash! What the bastard hell were you doing diving down there?

David Sanders: I'm goin' down there, and you're gonna have to blow me up too.
Romer Treece: As you please, boy.