Factual error: When they are driving in the convertible, before the tarantula attacks them with the stones, if you look at their hair, it's not moving with the wind. If they were driving a convertible that fast in real life, it would.
Factual error: When Dick has fallen into the hole in the swamp and is shooting at alligators, he manages to fire eight shots from a six-shot revolver.
Factual error: The tank the creature's in has sharks and barracudas, salt water sea creatures, when he's said to be of fresh water origin.