There are a number of instances of cruelty to animals.
The father teaches his boys how to fight. "The minute you see 'em blink, crack 'em," he tells Jack. During this training, he asks both Jack and his middle son to punch him in the face. Jack tries. The younger boy refuses. Father slaps Jack in the face several times, knocking him down. When the middle boy talks back to Father at the dinner table, Father reaches across the table, grabs the kid by the shirt and lifts him out of his chair. When Jack tries to make him stop, Father half throws Jack into his bedroom and slams the door, and we hear yelling and fighting outside. Later that night, Mother - furious with her husband over the scene at the dinner table - lunges at the man; he restrains her, wrapping her arms tightly in his. "Stop!" he shouts.
Through a window, Jack sees another couple arguing--the man yelling abusively at the woman.
Convicts struggle against law officers and kick inside police cruisers.
Jack shoots someone else's finger with a BB gun and encourages that same boy to stick his finger in a lamp socket, though there is no electricity to the lamp.