Continuity mistake: When Jet Li is playing football in the park and Maurice falls on top of him, Maurice's scar is on the left side of his lip, then when the camera cuts back to him it's on the right side. (00:50:40)
Other mistake: During the ending scene, when Samuel L. Jackson is walking away from the camera across the lawn, he passes directly between the platoon on the right practicing rifle drill, and the platoon leader giving them orders. Marines are taught to NEVER do this. It is called "breaking ranks", and a Colonel in the Marine Corps would have known this.
Continuity mistake: In the scene in which Leonard writes on the back of his picture of Teddy, "He is the one. Kill him," we see a shot of Leonard placing the picture on top of his tan jacket on the bed as he goes to write on it. Then, it goes to a close-up of the picture in which the jacket has disappeared and the picture is lying directly on the blue bedspread. It actually happens twice within that same scene. (00:15:15)
Character mistake: When the biologist guy talks about writing code for DNA he names the four codes as A, G, T, P, when they are actually A, G, T, C.
Continuity mistake: After the charity dinner, Meg Ryan and David Morse are having a fight in their kitchen. Note a missing drawer on the right hand side of the greenish cabinet. But at the end of the scene, when Morse leaves the room, the drawer is back where it belongs.
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)
Revealing mistake: When the Pterodactyl is flying around with the egg, its shadow isn't cast as she flies over the trees.
Continuity mistake: Near the end of the film, Adam and his clone make a jump for the helicopter to escape the explosion. In one scene, you'll see Sport Jacket Adam holding the ladder to the helicopter with Leather Jacket Adam holding onto the legs of the first Adam. After a cutaway scene, you'll see these two have switched places (Leather jacket on ladder, Sport jacket on bottom). The next time you see them, they're switched back in the correct order. (01:52:30)
Factual error: When Buck first sees the videotape left behind by Pastor Billings, Bruce Barnes tells him about a prophecy contained in "Daniel Nine, Chapter 27." As a pastor, Barnes should have known that the Bible is divided into chapters and verses. He should have said "Daniel 9:27," "Daniel Chapter 9, Verse 27," or "Daniel Nine, verse 27." The point is, "27" is the VERSE, not the CHAPTER. (01:15:05)
Suggested correction: You have to keep in mind that Bruce was one of the only people in the church to be left behind. He admits himself that he wasn't where he should have been spiritually. So it makes sense that he wouldn't quote scripture properly at this point, he was practically a brand new Christian that was thrust into leadership, learning with his new congregation.
Factual error: In the scene where the FBI agents have taken Giovanni Ribisi in for interrogation, one of the FBI agents says at one point "...and I want the whole C:/ Drive backed up on a floppy.", which is pretty hard to do, if not impossible, unless you've got about a 5Mb hard disk drive (depending on compression levels). But later on in the scene where Ribisi is actually doing it, he does it in about 10 seconds...with a 1.44MB floppy.
Continuity mistake: When Eric and Cody goes to the back alley somewhere, he unscrews the cap to the kerosene can and sets it down. In the next shot, the homeless man picks it up and unscrews it again.
Other mistake: In the beginning of the movie when Kimberly is shackled to the floor you can see that the padlock isn't locked. She could just take it off and be free.
Revealing mistake: While the guys are going for their physicals, there's a scene in which blood is drawn and you can clearly see the tube connected to the end of the syringe pumping fake blood into the container.
Continuity mistake: In the scene where James Spader meets Keanu Reeves in the graveyard, we first see a Ford Taurus taxi driving through the gates, but when Spader gets out, the taxi is now a Chevy Caprice.
Deliberate mistake: In Paris' death scene, he blows alcohol onto his torch that illuminates the creatures around him. However the area is still illuminated after the light from his torch has disappeared. (01:12:05)
Continuity mistake: In the last scene Kiefer Sutherland throws his cigarette away and turns to walk to his car but when the camera angle changes he is still smoking it, when he reaches the car he throws the same cigarette away for the second time.
Factual error: Towards the end of the movie when the President is addressing Congress, Joan Allen is seen outside of the building jogging. Joan Allen, being a senator and thereore a part of Congress, should have been inside the building.
Continuity mistake: When Harrison Ford is watching his wife laying in the bathtub ready to drown, the camera shoots her head several times between cutaways to Ford and the running water. Watch her head relative to the top of the tub in the various shots. In some her head is much higher than in others yet her body never moves.
Continuity mistake: When Samuel Jackson is about to be shot by the two corrupt cops, the Vanessa Williams character comes up from behind and shoots the black one in the head and he falls down. Then, they show her talking, and the same black man's arm and partial shoulder are in the shot.
Continuity mistake: At the end where Nick and Kaela swap eye colour, Nick's blue eye switches positions from right to left.