During the underwater escape sequence, every closeup shot of the actor's faces (inside the diving helmets) was lit with either a bright red or white light that was never seen in any of the wide shots.
Harold has his hen sitting on his shoulder under the diving helmet but with no room at one point it appears on his other shoulder then back on the the first one.
Corals are seen in the sea plus fish not native to the coast of Cornwall.
In the final battle just before escaping out of the water, a Gill Man damages his costume and there you can see on his shoulder a bit of his black swimming suit.
When Ben Harris goes into one of the rooms, he reaches around the door-frame and flicks the light switch a couple of times, even though he has been told that the electricity is off. He then leaves the switch in the "up" position.
A couple of minutes later electrical power is restored and the main light in the room comes on.
However this is set in England, where the "on" position for light switches is "down", not "up", so the light should not have come on.
At the end when the under water volcano erupts forcing flames above the water, the water stays perfectly calm.
Modern pistols in the hands of the men from 1803.
After a tremor, the Captain looks outside the window at the Gill Men and says "Look at them. They're frightened". While the two Gill Men are swimming around, you can see a modern scuba diver with shorts and flippers swimming above them.
When Harris tells Harold that Jill has been taken, how did he know when he was asleep in the other room and had no idea that Jill was even there?
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