redbaron2000

Plot hole: The creature gets caught in the fishing net and (after a struggle that shook the whole boat) freed itself. The scientists, upon drawing up the net, find one of the creature's claws, and thus they now seek its source. Shortly after, while Mark is busy loading a harpoon gun, Dave is protesting, stating, "This...this thing *alive* and in it's natural habitat..." It would seem that at this point, they know the creature is *not* dead, but very much alive. They dive, they see it, Mark shoots it with a harpoon, and then upon surfacing, they argue a bit before reporting what they saw to everyone else. So why after seeing it underwater, fully knowing that "this thing (is) alive," do they act so surprised to see it, as if they didn't have a clue it could possibly still exist?

redbaron2000

Revealing mistake: When the heroine sees the creature emerge from the cave and strangle the man she was with, she hams up her acting in the worst, most blatant way - she throws herself to the ground, screaming. She didn't even make it seem like she tripped or anything.

redbaron2000

Continuity mistake: When the scientists find the creature climbing onto the ship at one point, it's night time. It smashes a lamp, then jumps back in the water, swims across the lagoon, then standing up near the water's edge, it grunts and slashes at the spotlight they aim at it, then goes back underwater. Two of the scientists dive in to go after it, and follow it through an underwater (then above-water) cave. When both creature and scientists exit the cave, however, it is not only daytime, but the other scientists are waiting on the shore nearby.

redbaron2000