Corrected entry: In the scene where Mr. Turner enters Ashley's car, he takes the keys out of the ignition and uses the remote to lock the car (you hear the car alarm set). However, without unlocking the car, he puts the keys back in the ignition and starts it. This would trigger the immobiliser/car alarm.
pross79
24th Sep 2007
Correction: Actually, putting the keys in the ignition and starting the car usually overrides most factory installed alarms, in all the cars I have owned it is actually the only way to stop the alarm once it starts going off, we would need more info about this alarm system to say this is a mistake.
pross79