Continuity mistake: When Jack is driving to avoid the missile, he is sitting on the right side like all cars in England, but when he steps down from the car in the traffic jam, he steps out from the left side, and the driving wheel is seen in the left side like American cars.
Factual error: Simone is hit by a bus running after her niece. The bus is service number 106, however service 106 is Finsbury Park - Whitechapel and runs nowhere near Horseguards Parade, which is where the scene was filmed. Also the bus is operated by Sullivans Buses, when route 106 is actually operated by Arrivia. The depot code SM (seen on side of bus) is Potters Bar and not AE (Ash Grove) which is the actual depot that operates route 106.
Continuity mistake: The CIA have Basher in a Jeep with number plate WM13 GJJ. The very next scene, Tanner is being transported in a Jeep with exactly the same plate (you can see this just before the clock ticks to 1:34:55). Shortly after you see the CIA and Basher again in the same Jeep.