Best horror movie plot holes of 1977

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Exorcist II: The Heretic (1977)

Exorcist II: The Heretic picture

Plot hole: Dr. Tuskin warns that if Regan were to remember the events of her possession it could be so traumatic for her it could lead to suicide, even though Regan's therapy seems to be based almost entirely on what she can remember about the events of her possession.

TonyPH

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The Deep (1977)

The Deep picture

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

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The Crater Lake Monster (1977)

The Crater Lake Monster picture

Plot hole: Despite no one actually seeing the landing site of the meteorite, the sheriff takes his boat and the divers to the exact location of the rock. They go down and immediately find it.

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