Mule

In the beginning of the novel, the kid has an old mule that is too thin and too old to make a very good riding mule. The kid sells it when he joins the army and uses the money to buy a new saddle.

Water

The kid frequently travels through the deserts of Mexico and water is an important resource.

Brass Teeth

There is a jailer at the prison in Chihuahua City has brass teeth and Toadvine is later accused of stealing the man's teeth, presumably after he kills him.

Prison in Chihuahua City

The kid is put in prison in Chihuahua City after the army unit he signed up with is massacred by Indians. It is during this time that the kid hooks up with Toadvine again and signs up to join the Glanton Gang.

Chihuahua Government

When the kid first signs up with the Glanton...