Factual error: The flag on the outer left of the square keeps changing between the correct flag for Germany (horizontal black, red, yellow) as seen from the aerial shot when the bomb explodes, and a wrong version (horizontal red, yellow, black) which can be seen when Howard Lewis first accesses the square. (00:34:25)
Deliberate mistake: There are several large security mistakes that were obviously added to the film to move the plot forward. The takeover of "Control" would not happen that way. The Secret Service keeps it in a secret off site location which not even the security detail knows. This location is in some kind of very remote bunker to prevent what happens in the movie. Secondly, when the threat is identified and the switch to the double is made, the President would have been moved to a secure bunker created for the purpose until the threat was dealt with.
Plot hole: During Howard's flashback the viewer sees from his point of view the two SS agents who had been following Enrique fire multiple shots at the now revealed Spanish police officer as he was talking to another police officer (Javier) who had just approached him. The scene ends leading the viewer to believe Enrique was killed by the SS agents. However, in the final scene when it's revealed that he was in fact killed by Javier the SS agents significant fire (9 shots I counted) and presence is completely forgotten. (00:40:00 - 01:12:00)
Continuity mistake: At the underpass, when Taylor realizes that Barnes is right behind him on foot, he starts driving away. He's supposed to be speeding away, yet Javier, who is injured, is able to catch up to him on foot with ease.
Factual error: The engine noises coming from the Chevrolet Astra (blue car) are not coming from any engine in that car. Only the Vauxhall and Opel variants of that model got the high performance petrol turbo engines. It's clearly a Chevrolet from the logo on the front and back of the car.
Deliberate mistake: In the point of view of the Hispanic cop, he is being led away by a secret service (SS) guy when the cop hears an explosion, he punches the secret service man but before the SS guy can react, the second explosion goes off. In all the other points of view, the first explosion goes off and there is 30-40 seconds of a break before the second explosion goes off. (It's clear the director needed the cop to have the distraction of the first explosion to attempt to get away, but in order for the cop to escape he had the second explosion go off seconds after).
Continuity mistake: In Barnes' perspective, when the President is shot twice, immediately after this he (the President) tilts his head to the left in response to the agony. However, in Enrique's perspective, he tilts his head right, and this isn't right, since it's the same event but from a different perspective.
Other mistake: In the last scene under the Highway, when POTUS thanks Barnes for saving his life again and when the camera starts zooming out for the end credits, in the traffic driving above the accident there is a Mexican green taxi cab VW Beetle passing through. But, the whole movie takes place in Spain.
Continuity mistake: When Barnes shoots Taylor and Taylor crashes, we then see a shot of Javier on the floor, with his head on his right arm and his left arm beside it. But, when we see Barnes running to the car, Javier's body is at the lower left of the screen and his right arm has moved to his back.
Other mistake: During the car chase scene, the Opel Astra (blue car) repeatedly collides with other vehicles and objects on the front end, yet the airbags don't deploy.
Factual error: The movie was supposed to be in Salamanca, Spain, but was shot in Mexico City and Puebla, Mexico. There are constant landmarks that are easily pointed out if you have ever been to Mexico City. Best example: the metro is that of Mexico City. Salamanca doesn't even have a metro. The square where the president is speaking is actually two different locations. The one shot from above is Salamanca but the one close up is from of a museum in Mexico City. You can easily tell these two apart. The tunnel that the president is taken under so he can get into the hotel secretly is a tunnel under the anthropology museum in Mexico City. The chase scene is shot in the streets of Mexico City and Puebla's main square. The green taxi Beetles that are famous in Mexico City can be seen as well, as can the small buses known as "paseros" that are used as public transportation. There are many others as well. One shot of the chase scene was shot on the street I lived on in Mexico City. I watched the whole thing over a five day period.
Continuity mistake: This movie has a lot of problems with VWs. During the car chase, the blue car passes the red older 80's VW three times between shots. Later in the film, a blue VW rams into the turned over ambulance and in a later shot it is away from the ambulance and undamaged. In another part of the chase scene, the police car passes another blue VW two times.