Revealing mistake: As Mary Ann is dying, Kevin is holding her close to him, hugging her. From the behind shot of Mary Ann, you can see, sticking out from behind the right side of her neck/hair, is a tube and the yellow packet that held the blood/pump. (01:53:00)
Continuity mistake: While Matt Damon is questioning the CEO of the insurance company, he removes a large book of insurance information from the CEO's lap, pushing his microphone out. He then gives the CEO a document that virtually wins the case. When he reads it, the shot clearly shows the mic is back where it shuold be. Yeah, maybe he pulled it back. But in the next shot, when Matt asks him to read it again, he comes up to him and pushes the mic back to where it was before. (01:52:55)
Continuity mistake: Toward the end of the movie when Alex is waiting for Isabel on the bridge, Isabel sees Alex and hits the breaks. Her foot is shown stepping on the pedal and her polish color is a light color. Later when the two are in the ambulance, her toe nails are painted bright red. (01:38:28)
Continuity mistake: In the run-away tram scene the camera shows a group of scared passengers. One of them, who is holding a real dog a few shots before is holding a stiff, stuffed dog and is waving it around.
Continuity mistake: When Gregory is preparing his house for the arrival of his friends, (first five minutes of movie) he makes the bed and opens all the windows. When John walks in the room, all the windows are closed.
Continuity mistake: When Robert finds Celine after she has been kidnapped by O'Reilly and Jackson we see several times that O'Reilly has bled from her left nostril and the blood has run down onto her bottom lip. After she gets shot, the blood stops at her top lip. (01:22:30 - 01:23:50)
Continuity mistake: When Jack is leaving the shed with the bug bomb, the canister switches from being under one arm to the other.
Factual error: The heroine is trying to get to come on the trip in the minisub. She is asked "Name three under-ice amphopods" The word should be "amphipods", and her answer "Gamamarus" should be "Gammarus". (00:25:30)
Continuity mistake: When Courteney Cox and Aiden Quinn start kissing, her head is tilted to the right. The camera changes angles and her head's to the left.
Continuity mistake: In the scene where Madeleine's aunt puts the phot of Madeleine and Freddie in the book, she puts it in so that it cannot really be seen when the book is shut and it is facing backwards. When Madeleine picks up the book, it is facing the other way and is half way out of the book.
Continuity mistake: When Mr. Eddie goes back to his Mercedes after beating up the "tailgate guy", the left side of the bumper on the Mercedes is damaged. When they drive back into the garage, we see the left side of the bumper is fine.
Continuity mistake: In the scene where Chyna decides she needs to fall down the stairs to break the chair she's chained to she's supposed to be handcuffed. As she starts to fall and tumbles down her hands are not handcuffed and fling around wildly.
Visible crew/equipment: When Brad Pitt is taken prisoner by the English, he tries to escape and is thrown in prison. As the camera turns back to the door, the shadow of a microphone is visible left to the door.
Factual error: Secretary of State John Hay is depicted issuing the order to "initiate hostilities" against Spain. Unfortunately, at the time we actually went to war with Spain, John Hay was not the Secretary of State. That position was held by William. R. Day. Hay did not become SofS until September of 1898, after most hostilities had ended.
Continuity mistake: During the gun battle Kiefer's car gets shot up by the police but during the entire drive afterwards, the car shows no damage.
Continuity mistake: When Dante is lying back in the bathtub, watch as the pillow behind his head keeps disappearing and reappearing in the shot.
Continuity mistake: At one point near the beginning when they're collecting the crew, Robert Carlyle is in the car smoking. He lifts the cigarette to his face and he's not wearing a glove. In the next shot he smokes again and he's wearing gloves.
Continuity mistake: When Richard Gere's attorney tries to get into the murder scene apartment, the guard says to her (in subtitles) "if you mess up the murder scence [sic] you will be in some trouble". There is a typo in the subtitles.
Continuity mistake: In the scene with the electric shock treatment, Dr Yealland's shirt switches from army khaki to a purplish colour and back again several times.
Continuity mistake: In the final scene, when Parker Posey shoots her brother, just before they act out their JFK shooting re-enactment her shirt is unbuttoned and she begins to button it. A couple of minutes later, when she's holding the gun, her shirt is unbuttoned again.