Continuity mistake: After Huw has been beaten by his teacher and has staggered home, his brothers find him lying in the street. They are angered and horrified by what has happened - one of them says "He cut you to the bone". Yet when they pick him up to carry him home, we get a clear view of his back, and there isn't a mark on him.
Mr. Gruffydd: But remember, with strength goes responsibility - to others and to yourselves. For you cannot conquer injustice with more injustice - only with justice and the help of God.