Originally Nick Ingman was hired to orchestrate and conduct the score but due to some rescheduling issues it became necessary to move his recording session from Dublin to London to record in the Abbey Road studios. Because of other commitments at the revised recording time, Ingman had to be replaced by another conductor, Nic Raine.
When Stowe is talking to Chad, towards the end, the camera is on Chad over Stowe's shoulder. When Stowe is "talking" his mouth clearly is not moving and Chad is nodding his head.
When Det. Anthony Stowe wakes up form his coma, he opens his eyes wide and they remain open as frozen. In a follow up shot, they are less open. And when his gurney reaches his house, his eyes are closed again. The opening of the eyes was the cause for him be to put in his wife's care at home, instead of staying at the hospital's trauma unit.
During the hostage scene at the end of the movie in the warehouse, as Anthony Stowe is driving his car towards Callaghan's men, the film crew is clearly visible on the right hand side through the windscreen.
Anthony Stowe: [holding a gun to Lorenz's head]
If you're going to take a shot at a cop, make sure you kill him. And the fact that you were willing to take that shot means you have a lot to say.