Continuity: When Arns mother is about to die, he walks outside the monastery and sees a man practicing with a bow. At a distance, you can see the man shoot his third arrow. But when closing up, he shots again, this time it is also his third arrow (in both shots you can see two (2) arrows stuck in the target).
Continuity: Arn's horse changes appearance all the time though it is supposed to be the same horse. Most clearly is the white spot in the forehead which comes and goes between scenes.