ayrshire..england

This is well worth pointing out, but it shouldn't be viewed as a mistake in the film. Not only would these characters be unaware on unconcerned of this distinction, but they don't even seem that sure of their assumptions which are second hand. I believe the initial dialogue is:

"He's an Englishman?"

"That's what they say."



Inicidental unrelated fact: A city in Iowa was named after Ayrshire.

Trivia-

Billy the Kid first earned his reputation as a gunslinger in 1878, when he participated in a bloody frontier war in Lincoln County, New Mexico. The conflict centered on a business rivalry between "British-born rancher John Tunstall" and a pair of Irish tycoons named James Dolan and Lawrence Murphy. Dolan and Murphy’s outfit—known as “The House”—had long held a monopoly over the dry goods and cattle trades in Lincoln County. When they tried to intimidate Tunstall’s upstart operation, the Englishman enlisted the Kid and several other gunmen to protect his property. The tensions finally boiled over in February 1878, when Tunstall was murdered by a posse organized by Sheriff William Brady, a supporter of The House.

http://www.history.com/news/history-lists/9-things-you-may-not-know-about-billy-the-kid

Can you fly this plane?
Surely u cant be serious
I am serious,and dont call me Shirley