Revealing mistake: When the demonstration crowd is assembling in the plaza, there's a yellow tram entering on the left hand side. Watch as someone walks across the tracks in front of it and disappears through the corner of the cab. The shot must be a composite of the crowd amassing and the tram shot separately and then overlayed.
Revealing mistake: Early in the movie during the scene which Jason Bourne is being detained, the person from the Consulate while questioning Jason Bourne gets interrupted by a cell phone call. He has a Hand Spring PDA/phone and during the phone conversation you can see a red light flash on top of the phone. If you own one of these phones you know that means you have no cellular signal. How could he be having a phone conversation if he has no signal?