Continuity mistake: When the killer is using the R/C car bomb to follow Harry and his partner; as the R/C car approaches Harry's stopped car, it starts to swerve to the left, as if to go around. However, in the next shot, the R/C car is perfectly straight again, and lined up to go under Harry's car.
Continuity mistake: In the funeral scene, at the start Liam Neeson has a pony tail hair extension on, half way through it is gone and at the end, it is back on.
Chosen answer: Under those circumstances, when someone has just committed an extreme act to protect themselves it would be hard to claim that the third shooting was deliberate murder, that he was thinking normally, and that there was no further danger. From Callahan's perspective, he might have believed the shooter was not actually fleeing and still posed a threat if he came back.
raywest ★