In the 'Stop' story, in the end Aftab Shivdasni stands in front of mirror and says 'stop' to himself. This petrifies him and later on he is always shown with his mouth open in a long smile, which can't possibly happen, because as soon as he said 'Stop', he is petrified, and after speaking 'stop' one's mouth ought to be closed with lips protruding outward, not with a mouth open in smile.