Continuity mistake: Near the end when they're entering the Mexican village, Billy's coat disappears as he rides through the gate. (01:17:45)
Continuity mistake: When Billy is thrown out of window in a chest, he lands on the left side of the window / porch, but when he jumps up, he's on the right side. (01:38:50)
Continuity mistake: The knife in the post is first pointed up, then pointed down.
Continuity mistake: When Tunstall arrives at his place with Billy for the first time, Tunstall is clean shaven. At dinner that same night, he has a mustache.
Answer: Chivato in northern Mexico chihuahua area a Chivato is a male kid goat but also can be used as a young person full of energy, also an endearing term for a young boy. Lincoln Country is 2.5 hours from El paso TX and Chihuahua Juarez to be exact where many a cowboy spent their pay so the term would have the same meaning in Lincoln Ruidoso, Capitán where I grew up.