Visible crew/equipment: In the "Battle of Carthage" in the Colosseum, one of the chariots is turned over. Once the dust settles you can see a gas cylinder in the back of the chariot. (01:22:55)
Continuity mistake: When Maya enters Peter's office for the first time, you can see that he had just written something on his laptop. While they talk, you can see the word-program on the computer screen: it shows one page. Cut to Maya, then back to Peter: it shows two pages. Another cut: one page. This happens two or three times throughout the scene. (00:29:30)
Continuity mistake: When Tom Hanks cuts his hand and loses his temper, he picks up the volleyball with a bloody hand and throws it. When he picks it up, you can see that his fingers are spread. When you see the handprint that he makes "Wilson" with, you can see that the fingerprints are together and parallel.
Continuity mistake: When they first get to the island and they are playing cricket, Keety is telling them all the rules of the game and asks "who doesn't understand?" Richard and Etiene raise their hands - when the angle changes, Richard's other hand is raised.
Other mistake: Several close-ups of the business cards of Patrick Bateman and his associates reveal a misspelling of the word "Acquisitions" (the "c" is missing - not a small error, given that this is the name of their department). (00:18:35)
Suggested correction: The business cards seen in that scene are supposed to be bad. An expert on business cards once reviewed the scene for a YouTube video and pointed out many aesthetic flaws in them, including this one. The subtle joke is that Patrick and his friends are all pretentious and deluded, thinking they're masters of style while they can't even spell words right. This is more explicit in the book, where paying close attention to the clothing Bateman describes, people's outfits make no sense.
Continuity mistake: When Julia is trying to figure a way out the cell, she starting feeling around the edges of the glass panels etc., and she then comes to the end and stands by the green bench which is at the side of the cell. Julia's black heels sit on the bench, but then when Julia notices the pipe and climbs up to attempt to pull it, in the overhead shot her black heels have vanished from the bench. (01:08:40)
Other mistake: The Mexican newspaper that Michael Douglas is reading in the helicopter has a headline where all of the accents are missing. No newspaper, even a cheap one, would make such a typo error. (01:27:35)
Continuity mistake: In the scene in the karaoke shop, watch the light through the window. Sometimes it's daylight outside, sometimes it's dark.
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)
Continuity mistake: At the beginning "Pete" asks Violet for her autograph on a time card. She signs it and the "T" is not crossed, and when Pete puts it on the board it is crossed. Then at the end when Violet's dad buys it from Pete it is again not crossed. Also if you look at the "V" when she signs it and after Pete puts it up they are different. And lastly, when Violet signs her last name it is spaced but when Pete puts it up it is jumbled together. Her signature is different all around. (00:01:30 - 01:27:30)
Continuity mistake: When Gene Hackman is helping his wife zip up her dress her hair goes from hanging straight down her back, to being over her shoulder. It cuts without giving enough time to assume that she moved her hair.
Revealing mistake: As Thomas crosses the viaduct gap, a rope can be seen pulling him.
Continuity mistake: Early in the movie after Haley Joel Osment befriends a bum they are sitting at the kitchen table and the bum pours Haley a bowl of Captain Crunch and fills it over the rim of the bowl. In the next wide shot the bowl of cereal is below the bowl's rim level as they pour milk into it.
Continuity mistake: When Shepard pulls Johnny down the stairs, then seizes the boy menacingly, Frank points a shotgun at Shepard and tells him to let Johnny go. In the three close-ups of Frank, note the handcuff around his wrist. When Shepard tells Frank that he'll snap Johnny's neck, in the next medium shot facing Frank, the handcuff is around his wrist the opposite way, and then it reverts back to the original way. (01:48:55)
Continuity mistake: When we see the police officer checking the hit counter on an adult web site, the hit counter goes down from 1,739,986 to 1,739,944 a few seconds later.
Factual error: In the ship yard after the party, one of the navy crew is working on a sub and he is using a yellow plastic handled grinder. All tools in this era were metal handled. He's also wearing tennis shoes. (00:13:15)
Continuity mistake: At the trial, the defence lawyer puts a dollar bill on the witness box while he is questioning Annie, which keeps moving, without anyone's help.
Visible crew/equipment: When Bob and Charlie enter the boardroom for the meeting with the suits in the zoo's administration building, the actor's green T-mark is visible on the floor under the table, where Bob stands. (00:33:05)