Corrected entry: While John and Matt are driving into West Virginia in the BMW, they have a conversation in the car. The back left window has been broken out, but there is absolutely no noise from the wind that would be whipping through the car at the speed they were going.
Corrected entry: John McClane is a Police Officer, and of all the people in the world, a Police Officer should know that its been virtually impossible to hotwire a modern car for nigh on ten years, and even less probable to try it on a high value BMW.
Correction: Really? because someone did it in the news in my city last week.
Corrected entry: The ip addresses that the hackers would obtain when running their traces are internal network ip addresses. They look like 10.XXX.XXX.XXX or 172.XXX.XXX.XXX. They should have gotten the external ip address of the router or the firewall to that network. Also, it is very difficult to get a name associated with an ip address, especially if the ip address is for residential Internet usage because isps use dynamic ip addressing instead of static ip addressing. This means that the ip address of a customer will change every so often.
Correction: Most ISP's do offer a static IP address for an additional fee. Also they could have installed a backdoor to have when they need to terminate the hacker.
Corrected entry: Matt Farrell shuts down one of the turbines providing cooling to the NSA computers, and the computer screen even shows 'turbine failure', yet later in the movie when Matt Farrell enters that computer room, the supposedly failed turbine is still spinning as fast as the other two.
Correction: That is because, as Matt obviously said he would do, he just hacked to set the alarm, not to shut the turbine off.
Corrected entry: McClane's daughter is caught in the lift of a high rise when the power turns off. When she is rescued she is - minutes later - at the main computer facility outside of Baltimore. How did she get there so fast? She lived in Jersey close to NYC.
Correction: The film doesn't at any point say that Lucy was in her home town, she could easily have happened to be near by, or near enough for her to be flown quickly by helicopter.
The goon who got her out of the elevator said he was with the FBI Jersey office.
Corrected entry: When McClane needs a vehicle to go to the power plant in Virginia he breaks the driver's side window of a BMW. But as they are driving the window is rolled up and not broken.
Correction: He broke the back window on the driver's side. You can see it is still broken as they are driving.
Corrected entry: When McClane is driving the semi chasing the Haz-Mat van, he radios Warlock to patch him through to the FBI. After getting patched through he tells the FBI agent that he is chasing the van onto 695. 695 is the Baltimore beltway. There are noelevated highway sections over the Baltimore beltway the way the movie depicts.
Correction: These elevated over-passes were added to the sequence to set up the later chase scenes and for dramatic purposes. Therefore, no mistake here.
That's still a mistake since the overpasses don't actually exist. It's supposed to be 695 and looks absolutely nothing like it.
Corrected entry: When McClane is attacking the helicopter from inside the tunnel, the guys in the helicopter see him coming when he is still deep inside the tunnel. They would not be able to see that the car was moving - let alone that it is McClane attacking them.
Correction: My 17 year old BMW is surprisingly quiet, even if the windows or sunroof are open at 80 mph.