Character mistake: When the front door of the old F-unit is refusing to open the guys put their shoulder to it. The door they are trying to bash outward actually swings into the area where they are standing. If they really wanted to go out that door they should have unlatched it and pulled.
Runaway Train (1985)
1 character mistake - chronological order
Directed by: Andrey Konchalovskiy
Starring: Jon Voight, Eric Roberts, Rebecca De Mornay, Kyle T. Heffner
Continuity mistake: After Manny's fingers get crunched between the cars, blood sprays on his face. In the next couple of scenes there is hardly any there. Also, when the prison warden get sprayed with the fire extinquisher he is cleaned up in the following shots.
Manny: You do what you have to do, I'll do what I have to do. Whatever happens, happens.
Trivia: In the film Eric Robert says jokingly to Sara "Why are we here? I'll tell you why...We're on our way to Las Vegas to see our good friend Wayne Newton." In Best of the Best 2 (1993) Eric Roberts arrives at Las Vegas at the end to stop a fight, which is being hosted by Wayne newton.
Question: Why didn't they go back to the 3rd or 4th locomotive where they could access the brake hoses and disconnect one of those, instead of trying to get to the hoses between the 1st and 2nd engines?
Answer: That's what they were doing, going car to freight car break the hoses. They knew it would slow the train down but not stop it. Slow enough so they could jump off without getting injured. That's why they were desperate to get to the first engine not only to break the hose but disconnect from it.