Revealing mistake: When Gary is attacked by the snake, as it's wrapping around him, his arm passes right through it.
Other mistake: After they blow up the dam blocking their passage, there is a far away shot as they are going up river and there's a grassy landmass that goes across the river blocking their route up river.
Continuity mistake: Jennifer Lopez's eyebrows go from sparse to filled in in several scenes.
Other mistake: When the anaconda is behind the boat she shoots at it about 5 times with a bolt-action rifle, with no magazine, and never reloads.
Answer: He played into his greed. Told him there can be a lot of money made if you capture an anaconda like that one.
lionhead