Revealing mistake: At the beginning, when Gail is attacked by a moray eel - we don't see it, but that's the assumption - and she is banged against the sunken wreck of a ship, and then, when she is released, her mouthpiece is not in her mouth and she tries to swim to the top as fast as she can - all of this is done by a stunt double, understandably, we can see this by her hair, which is much thinner and straighter than Jacqueline Bissett's hair.
The Deep (1977)
1 revealing mistake - chronological order
Directed by: Peter Yates
Starring: Nick Nolte, Robert Shaw, Jacqueline Bisset, Dick Anthony Williams
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.
Henri Cloche: If his tongue moves again, cut it.
Trivia: Author Peter Benchley has a cameo as a U-boat crewman in the prologue (extended version).
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