Geography
One thing i don't get is that the train is.supposed.to.be heading in a certain direction to a specific destination - the border, and hence slowly away from.the state where caspers gang is from. And yet for some.of the film the story plays out as if it is a stationary setting that people can walk in and out of with ease.
For example the kid smiley. He is told to get off by casper and slowly walks back to the gang home. Which can't be that close because the train was moving through the night as the 3 gangsters slept.
Yet he managed to walk back to the gang, attend the conference and then still get to the next town in.time.for the train to arrive ( even though we saw it moving again through the day) in.time.to.play to charlar with the local youth and then catch the train.
Then again when casper and the girl.get off the train quite a bit later in the story they have no transport yet conveniently manage to get to the house of someone casper knows well.enough to feed and house them.both and who also knows the sol guy from.his chapter. ok i get that it can be explained.that it was someone from outside his area he worked with but it just such a coincidence that he happens to get off walking distance to the only person he knows.in the world.that won't shoot him on the spot. And then the girl.just happens to.meet the guy she was travelling at the shelter and then ms 13 happen to get the right coyote ( camper was.a very careful type) and smiley just happens to.be standing in the bit casper is running to.
And how did smiley get to the other ms13 chapter ( which from the conversation seemed a distant one) he was sent away and clearly arrived there on his own.