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
Continuity mistake: When Richard Denning and Richard Carlson approach the boat ladder coming back from their first dive in the Black Lagoon, you can see the net hanging underwater just to their right. It already has the huge torn hole that is in it when they hoist it up after the creature is caught for a moment in a later scene.
Carl Maia: Well, now we have a lab, such as it is.
David Reed: Let's hope we have some use for it.
Mark Williams: I'll be disappointed if we don't. Assuming, of course, Dr. Maia's facts are well-founded.
David Reed: Dr. Maia's a scientist, not a fortune-teller! How can he guarantee anything?
Kay Lawrence: Well, it seems to me a scientist has need for both vision and confidence.
Mark Williams: I didn't mean it as any personal criticism, Doctor, it's just that I also look forward to success.
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