Factual error: At the end of the movie it is about 7:42am in Langley, Virginia. In Suzhou, Tom Bishop is being rescued out of the prison and as he is being flown away you see sunlight poking down through the clouds in the backdrop. It would be 8:42pm there. Since they showed the Berlin wall falling on the news that would put the film at the beginning of November in 1989 where it would be dark at 9pm.
Factual error: Part of the movie is set in Beirut during 1985. Periodically, there are scenes with Robert Redford's character working from a command post in the American Embassy. Behind him, is a quite modern looking 15" monitor. The interesting part is that although the monitor looks out of place, the makers of the movie saw fit to fill the screen with monochromatic "green" information, which would be consistent with 1985.
Factual error: Redford's character speeds towards his office in Langley, Virginia driving his Porsche. As he passes a Georgian style building and the camera position, road markings (zig zag lines, metal road studs and a 'keep left' bollard) are all momentarily visible. This very short scene was obviously filmed on a UK road, certainly not in the US.
Factual error: Robert Redford's call to the London Stock Exchange to liquidate and transfer his holdings to the Caymen Islands makes no sense. The LSE does not provide that kind of service, it is a regulatory body which admits companies to the Exchange and regulates them. In reality he would have called a bank or stockbroker to execute this type of transaction. And that banker or broker would not have been sitting in the LSE building on Old Broad Street in the City of London. There is no physical trading floor at the LSE, in the way which is depicted in the film, for the banker or broker to work from.
Factual error: The part of the film set in the CIA Headquarters is suppose to take place in 1991. However, Robert Redford's character seems to have both a cell phone and a two-way pager that are quite advanced for the early 1990s. Not to mention the fact that cell phones aren't allowed in places like the CIA headquarters, because they aren't secure and they might allow people to eavesdrop on classified conversations.