Why does Jimmy have a heavy Chinese accent? If we are to assume that he is first generation Chinese, then he should have little or no accent whatsoever. His father has the same English fluency and accent as Jimmy, which is highly unlikely for an adult to develop a foreign language at the same rate and level as a child or adolescent. It would be much more realistic for Mr. Chang to speak broken English, if any at all, if he'd only lived in America for a short time. If he'd been there longer, then Jimmy should have no accent.
Sheriff: I won't lie and say I'm not pleased but...to make this thing legal-like I-I better swear you all in as deputies.
Hoss: That's good. Always did want to wear one of them deputy badges, anyhow.