Revealing mistake: In the final scene as Doc tell Billy good-bye if you look up to the top right hand corner of the screen you can clearly see a jet trail in the blue sky. Certainly not possible in those days. (01:42:20)
Revealing mistake: There is a scene where one of them jumps on a horse, and you can see one of the crew holding on to the reigns as the horse throws its head back.
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.