Factual error: The movie takes place in 1868, and every guy and his dog are wielding cartridge conversion Army, Navy, and even what appears to be Walker colts. Unfortunately, such conversions were not performed until 1869, after Smith and Wesson's rights to the Rollin White patent expired.
Gideon: Your sister, she don't take kindly to thieving. There's plenty of time for that when you grow up.
The Kid: How do you write "wife"?
Hayes: Kid, that's W-H-O-R-E. Don't much matter how you spell it, a woman ain't gonna be yours unless you're paying her for the night. You pay her to be sweet to you, kid, that's all. Don't never mix up money and love.