Factual error: During the first battle with an Anaconda, the 55-gallon fuel drums lashed to the deck of the riverboat are swept over the side, where they sink to the bottom of the river. This plot device drives the rest of the movie, since the boat must make a dangerous detour through "Anaconda country." There is just one small problem with this: Fuel drums full of diesel fuel or gasoline float on water. The fuel in them makes them buoyant. It would have been a simple matter for someone to get a rope or a boathook and retrieve the fuel drums before they floated away.
Factual error: David Egan's obituary says he died on 'Wednesday July 5th 1997'. In 1997, July 5th was a Saturday. (00:45:30)
Factual error: When Roland is walking in the pouring rain and talking about killing the T-Rex, he has his gun slung over his shoulder vertically and barrel-upwards. If you were to do this in real-life in a tropical rainstorm for very long, you would run the risk of water entering the barrel and causing problems with the gun. And as a professional hunter Roland would know better. (01:07:50)
Factual error: The movie theater ticker says it's Monday, April 12th, 1997 - but the 12th was on a Saturday. (00:00:20)
Factual error: The child Lily grabs an apple from a tree, the tree is an oak. Oak trees don't fruit apples.
Factual error: When D.J. is attacked by Dr. Weir, he is grabbed by the throat and is squeezed until his windpipe is broken, shown by the way he was breathing (or struggling to). When Weir seizes him again and throws him against a support beam, he screams in a way impossible for someone who just had his windpipe crushed.
Suggested correction: Dr. Weir doesn't crush DJ's throat at all. The noises he makes are simply choking noises because he is being picked up by his throat, there isn't even anything in the scene to imply his throat is being crushed, which in reality requires considerably more effort than most people believe.
Factual error: In the scene where Priest fires at Spawn from the balcony, a magazine can be seen sticking out of the bottom of Spawn's P90. This reveals it is a fake P90 shell on an Ingram Model 10. The P90 has a clear magazine that sits on the top of the weapon.
Factual error: When the beast itself moves, it bounds, but the sound effects make it sound as though the beast is running.
Factual error: In reality, the normal air pressure of a room (about 14.7 psi) would be nowhere near enough to force the newborn's body out through such a tiny hole.
Factual error: The sirens on French ambulances have two distinct tones, not a single oscillating one.
Factual error: When we see the detective pour the sample of Martin's sperm onto Joyce's body, the liquid is thick and bright white, like PVA glue; however the detective acquired the sample several hours earlier, and ejaculate loses that appearance/consistency almost immediately (30 minutes at most), becoming thinner and almost transparent.