Continuity mistake: At the lead-in to the fight scene, the train had only passenger cars, with a single baggage car in the normal spot right behind the locomotives. While the train is still in motion, the baggage car is seen at the rear, and a flat car and caboose are now part of the train.
Huey Walker: Mandatory aids testing for all government employees. I guess that means you, Buckner. I wouldn't worry though, you look like a practitioner of safe sex. As a matter of fact, you look like a practitioner of no sex.
John Buckner: You want to know why, Mr. Walker? Because from here to Spokane, you and I are joined at the hip. You do what I say when I say it. You don't even take a piss without me watching. If you try to escape, I'm authorized to stop you any way I see fit. Do I make myself clear?
Huey Walker: Don't worry, kid. I won't give you no exuse to blow me away.
John Buckner: That's good.
Huey Walker: Hey, do you want to watch me piss now?