Other mistake: In the beginning of the film above the box office the date says April 12. When Sidney looks at her watch the next morning it's not even close to that date. (00:00:35 - 00:12:55)
Suggested correction: The mistake is correct, but the watch part has nothing to do with the incorrect date. It is the next day.
Other mistake: In the scene where Ripley throws the basketball at Johner, Christie says to Ripley, "Ok, I've got a new game, tag .." He hits her with the handles straight in the face once, he misses the next shot, misses again, and Ripley hits him to the ground, but you neither see or hear the handles fall. (00:23:15)
Other mistake: Toward the beginning, when the characters wonder aloud what the rumbling noise is, someone suggests that it's the ventilation system, to which Rennes responds "No vents." However, in the passages between rooms there are panels with ventilation slits in them (which you can plainly see even as Rennes says the line), and it's pretty impossible that the characteristically level-headed and observant Rennes wouldn't have noticed that.
Other mistake: When Andy places the wedding ring on Serafine's finger after jumping off the Statue of Liberty, he places it on the index finger. Don't people usually put a wedding ring on the ring finger?
Other mistake: After Barry (Ryan Phillippe) is put in the hospital, the four of them are talking about the murder and who tried to kill Barry. If you look at the door to Barry's room it is open - didn't anybody hear them talking about murders and a man with a slicker? (00:43:45)
Other mistake: The ship's captain at the beginning is supposed to be speaking Brazilian Portuguese. In reality, he is speaking gibberish, mixing Spanish and Portuguese with a very basic grammatical structure.
Other mistake: After they blow up the dam blocking their passage, there is a far away shot as they are going up river and there's a grassy landmass that goes across the river blocking their route up river.
Other mistake: When the velociraptor jumps for Ian, it hits an electric panel and shorts it out (the red lights go off). In the aerial shot of Kelly's acrobatics the panel lights are on and the raptor is gone. When it jumps from the ground to the catwalk the lights are off again. Then on again when Ian and Kelly run from the shed. (01:36:00 - 01:36:48)
Other mistake: Towards the beginning when someone is looking at a newspaper about the airliner being blown up, there are nonsense articles on the paper and pictures of people that don't match the names under them. With some white guy's picture over the name Michael Jordan on the left of the page, and then on the right a picture of a white woman with the name Will Smith under it.
Other mistake: In the shot where the elevator door opens after the screenwriter hears the music playing, the control panel (for the basement) shows the building goes up to eleven floors. When the elevator opens on Floor 5, we can see the control panel on this floor only goes up to ten floors, despite being in the same building. (00:41:55)