Ethnic Scrappy: Pancho, the none-too-bright Mexican peasant. On the other hand...
Fair for Its Day: Juan is a comparatively positive portrayal of Mexicans. Although he may or may not be an outlaw on the run, he is presented as brave, noble, intelligent, and the most mature of the three accused men.
Sparks is subservient to the white men, but is also a positive, non-stereotypical African-American character, who joins with the posse out of a desire to see the law enacted fairly and goes out of his way to comfort the three accused men. He even gets a speech to Carter explaining how his own brother was lynched without anyone bothering to find out whether he was guilty or not.
Some Anvils Need to Be Dropped: Vigilantism is a bad thing. The law is there for a reason, and without due process, one cannot know for sure who is guilty and who is actually innocent.