For a PG-rated movie, the violence is actually pretty heavy.
The warden scratches Mr. Sir's face. Later, the wounds are shown swollen.
A stagecoach turns over; three dead men in open coffins are shown.
A woman abruptly shoots the town sheriff (off-screen), killing him.
In the act of a racial hate crime, a black man is shot in an extreme wide shot.
A boy cuts his hands on the edge of a shovel (some blood is shown).
Three boys get in a fight and one boy is choked but not killed.
A boy whacks a man with a shovel and the man is knocked out (some blood is shown).
A man tells a boy not to move and points a gun in his direction. He then shoots a lizard.