None.

In a dream sequence, a man takes a cat from a boy and puts it into a bag. Then he is about to kill it with an axe when the scene ends right there.

A man slams another man's face onto the prison floor several times, until the latter one calms down.

A man throws a chair on a prison door, and constantly hits the door with his hands when another man throws him back to his bed.

None.

Casual smoking.

The dream scene that involves a man about to kill a cat can be upsetting for some, even though the actual killing is fully implied.