Revealing mistake: Right at the start, when all the police cars skid to a halt, there are tyre marks on the ground from previous takes. (00:00:30)
Revealing mistake: When Bourne jumps through the glass window during the rooftop chase, it is very obvious that the glass shatters before Bourne crashes through it.
Revealing mistake: In the commentary, the director states that the crowds in Tangiers were real, not hired extras, and that therefore there was an effort to avoid having them look at the camera. However, when you can see the crowd walking up a street, their backs toward the camera, while one man (to the right) faces the camera while holding his cell phone up. He is obviously taking pictures of the camera crew, probably unaware of the fact that he is being filmed, as it seems the shot is filmed from afar. (01:01:50)
Answer: Knowing Bourne, he must have had a keycard on his person. Remember that Landy guided Bourne back to the CIA New York Headquarters; she could have easily slipped a keycard in the Taxi Cab when Bourne was being picked up at the airport. All he would have to do then is avoid being detected by using the fire exits (hence going through the back).
Jason Riley