Factual error: When Bruce Willis is looking at his old high school news clippings you see a professional baseball score on one of the newspaper clippings. The game was Pittsburgh vs. Arizona Diamondbacks. The Diamondbacks were not a team yet when he was in high school. (00:33:35)
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 the beginning, Leonard looks at a copy of John G/Teddy's driver's license. The expiration date is listed as 2-29-01, but of course, 2001 was not a leap year, so there would've only been 28 days in the month. (00:12:45)
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: 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: 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 average speed of an African Ostrich is 31mph, not 27mph as noted in the film.
Factual error: When the police are looking at the reflection of a neon sign in the glasses in the picture of the girl, the letters are reversed as you might expect. But the sign is on the glass front wall of the shop, facing the outside. Since the photo was taken inside the shop, the inside view of that sign would have already been reversed, and the reflection should have been the right way round. (00:35:15 - 00:39:40)
Factual error: When Wolf is starting to turn and the Queen contacts him, after he storms off, in the daylight in the distant background on top of the hill electricity towers can be seen.