Corrected entry: When the girl is strangled in the boat, after she is dead you can see her abdomen moving as she breathes.
Corrected entry: When the anaconda eats Jon Voight whole, there is a movement over the other side of the room, and it slides over at incredible speed. Snakes take hours to eat their prey (especially the size of a man) and weeks to digest. During this period, they can barely move at all. Also, after it spits him out (again, not possible), he winks.
Corrected entry: When a tree falls on the boat the posse is forced to get to land and fight the snake in the water. However, when they return to the boat in haste, the huge tree is gone and they continue down the river.
Corrected entry: Adult snakes, even the size of the one that appeared in Anaconda, can't eat more than one large meal at a time before going into a torpor that lasts for 3-6 months. After the snake ate the first person the rest of the cast would've been in no danger. Also, if the snake kept on eating people, one after another, in real life it would likely die, its digestive system couldn't handle the sheer amount of food.
Corrected entry: When the anaconda lunges for someone from the top of the waterfall, it quickly shoots down, grabs them, and easily lifts them up. In reality, if an anaconda was stupid enough to attempt this stunt, it would have just fallen off. They are sluggish and out of place out of the water, and could never move like the whiplike creature portrayed in the movie.
Corrected entry: When the anaconda is behind the boat she shoots at it about 5 times with a bolt-action rifle, and never reloads.