Factual error: Marine One should have rushed directly to a warship on the water. The navy would have had many of them on alert well before, and Marine One would have had a pre-planned escape route secured by fighter jets.
Factual error: In such an insecure situation, the SS would have arranged a secure bunker ahead of time for VIPs on site. There is no mention of it.
Factual error: During the attack on the President at the church, where is the rest of the motorcade? The second limousine, several SS armored SUVs and the entire Counter Assault Team are missing.
Factual error: The rescue team at the MI6 safehouse takes ages to arrive. A spec-ops team with helicopters should have been on alert and arrived in minutes.
Factual error: The role of MI6 shown in the film actually falls under the purview of MI5, Britain's domestic intelligence service; as the country's version of the CIA, MI6's mandate is the covert collection of foreign intelligence overseas.
Factual error: When they spot the guy with the missile from the helicopter, the pilot says "we're being pinged", and Banning says "stingers." Stinger missiles are infra-red seeking, passively tracking the heat of a target, so there's no way to know if you're being tracked by one or not. As a highly-trained secret service agent, he'd know that. (00:36:50)
Factual error: London is shown to use the two-tone air raid siren to warn Londoners of the danger. The problem is, these sirens were decommissioned in 1992 following the end of the Cold War. (00:51:50)
Factual error: Throughout the Helicopter scene they are referred to as Marine One, Marine Two and Marine Three. There is a couple of problems with this. Marine One is correct as it has the President on board. Marine Two only has this call sign when the Vice President is on board, which he is not. And finally, there is no Marine Three call sign. (00:36:10)
Factual error: When the president arrives at the church, he gets out of the limousine, and they close the door. The Secret Service keeps it open for emergencies. The church door also gets closed, same issue. An agent would be there keeping it open. Then the entire motorcade is missing including the second limousine which is always present.
Factual error: During the fight scene in the London underground, it's suppose to take place at Charing Cross station. Charing Cross is on the Northern Line and the Bakerloo Line. If you look at the map in the background that list the stations, none of them make sense. Green Park, Bond St and Baker Street are not on either of those lines, they are on the Jubilee. They skipped quite a few stations as well on the Jubilee. They picked random stations and made a map. (00:00:48)
Factual error: When the President is getting out of his car, we see the thin doors, like any usual car. However, in reality, Cadillac One has thick doors that weigh as much a Boeing 757 door. Not to mention the vulnerability of the car used in the movie. There's a reason why the Cadillac One is nicknamed "the beast." (00:23:10)
Factual error: Air Force One has landed. The caption reads: "Stansted airport, 20 miles north of London." it's closer to seventy miles. They probably wanted to get to the city quicker. (00:17:20)
Suggested correction: It's 38 miles to drive down the M11 from Stansted to St Paul's cathedral - and about 20 as the crow flies.
