Factual error: The serum is transported by blood. Hair has no blood traveling to it, only the root. So, unless Bacon shaved his body clean, his hair wouldn't have become invisible, likewise all of the fur on the gorilla.
Factual error: The teens are traveling presumably along the Meadowbrook or Wantagh parkways, when they enter Jones Beach. They see a sign just before the beach entrance that says "New York: 93 miles", when Jones Beach is less than 15 miles from NYC limits and approximately 25-30 miles from Manhattan.
Factual error: In one of his first appearances, Proulx the Architect is using a modern pen on a pad of paper when taking notes.
Factual error: In the beginning of the movie, the killer calls Cotton on his cell phone. When the killer hangs up on him, you hear a dial tone. When someone cuts you off on a cell phone, you don't get a dial tone. (00:02:40)
Factual error: When Claire pulls herself out of the bathtub, she falls right over the center of the tub. The bloody fingerprints would have been wiped away or completely smeared by her nightgown and bathrobe during the fall.
Factual error: When the husband swims to the other side of the lake to get some stuff in the truck, he lights his cigarette on one side and when he arrives on the other side, it's still lit. How could he swim trough the lake without getting his smoke wet?
Factual error: When the girl with no kidney is decapitated, there's not nearly enough glass left in the window to take her head clean off while leaving it in the fixture.
Factual error: KCN does not causes you to internally bleed, so Yuka Nakagawa wouldn't have spat up blood and died like that in the lighthouse, but would have rather died due to cessation of respiration.
Factual error: When the group is travelling through the canyon near the end of the film, they are burning liquor to light the way, yet there is a lot more light than would be given off from this small flame. And none of it is flickering as would happen with a naked flame.
Factual error: The actress Sasha Barrese is credited at the beginning of the movie as "Sasha Berrese".
Factual error: When Bateman is in his apartment with his secretary, he points a large tool at the back of her head, unbeknownst to her. That is an air powered nailgun for installing plywood. The only way that one could be used is with an airhose and a compressor. The fitting for the airhose that sticks out of the bottom has been removed because it usually would point straight down and stick out about 2 inches. (01:02:45)
Factual error: The sharks in this movie growl. Sharks do not growl.
Factual error: After a new camera man is hired, Wagner, the camera man starts showing off to his fellow crew members that he invented "slow motion". In the next scene he demonstrates this by spinning the handle of the camera slowly. In fact this is not right, when the movie is projected the movie will be speeded up instead of slowed down.
Suggested correction: The serum could have been absorbed by the roots and made its way to the tip of the hair strands (similar to colored water going up a piece of celery, changing the color of the celery).
Mammal hair is not porous and is not subject to capillary action.