We see Frank hanging above the moving train, the locomotives having already passed him. Then we are shown what is happening on board the train. When we return to Frank, the tops of the locomotives are passing under him again.
When Buck pours a drink for Nate in the jail cell, the glass has more in it in the first shot and less in the second before he takes a drink.
After the accident Frank is climbing the hill towards the train. There are several paths of footprints thru the fresh snow. One to the left and another up the path he is climbing.
The illuminated numbers seen on the locomotives should show the locomotive number, not the train number. (It is true that there are instances where the lead locomotive number may be used as a train number, but that can't be the case here because here because the train number was known in advance. And even if it was, the train's second locomotive would still show a different number.)
In 1997 the Colorado State Patrol used a new fleet of silver/blue Chevrolet Cameros, silver/blue Ford Explorers and silver/blue Ford Crown Victorias, not the white Fords that movie shows.
When the Cadillac Eldorado falls to the bottom of the cliff the hood is not connected to the car and falls to the side revealing that the car has no engine.
At the car garage, we see a calendar for February 1996. Every day on the calendar is listed as falling on the wrong weekday to what they really did. For example, February 5 1996 was a Monday, on the calendar it is listed as falling on a Tuesday.
After the accident Frank is climbing the hill towards the train. There are several paths of footprints through the fresh snow. One to the left and another up the the path he is climbing.
The closed captioning uses Jared Leto's name (Jared) instead of his character name Lane.
In several scenes, squealing tires are heard from a car skidding on a snow-packed road. Tires do not squeal on snow.
The scene where a rancher drops off "Doc" is filmed in a desert. The part of New Mexico, along the route from Amarillo to Raton, N.M., does not pass through any desert country. That is a rolling-prairie region, with a few small volcanic peaks in the region as you get closer to Raton.
The killer is supposedly headed to Utah, but at the end of the movie when the train is coming out of the mountains it is actually headed east and is just outside Denver passing Coal Creek Canyon(you can see the Boulder Flatirons to the north).