Factual error: At the start, just after Sydney has the phone call regarding Will, she goes to meet her dad and says that they can save Will, if they get the Rambaldi document from the CIA and the ampule from SD6. In fact, it is the other way round; the CIA have the ampule, and SD6 have the page.
Factual error: Francie alters Will's cell phone so she can download items from the CIA's computers via it. In order to start the link, she calls him on the cell phone, asks him to look up a recipe on his computer, and then this cell phone is able to download a 3 gigabyte file. The phone Will uses has a maximum data transfer rate of 14.4 kbs; wouldn't Will get suspicious after he's forced to surf for this recipe for 57 hours while that gigantic file downloads?
Factual error: When Sydney goes to Uzbekistan, it isn't Uzbekistan. The restaurant where the meeting occurs is not anything made by Uzbeks, and it is too remote to be made by foreigners. The land around is also very lush, unlike anything in the deserts of Uzbekistan. The people are speaking Arabic, instead of Uzbek and Russian, and the sign on the wall is also Arabic. The guards are also wearing what appears to be a Russian uniform, even if the badge is correct.
Factual error: When Sloane is talking to Emily on the telephone, Sloane's phone emits a call waiting beep and the camera focuses on the phone's screen. There are two factual errors here: 1) The phone icon for "Line 1" near the top right hand corner of the phone display is in the "on-hook" position indicating that there is no call in place. 2) The call information is displayed incorrectly. It is obvious that this is a Cisco XML card with the text entered.