The number of coaches behind the locomotive changes between 4 and 5 in a few shots.
When the dirt bike chases the train, the stunt driver is clearly Caucasian with his arms and hands painted black to match the character.
When the train crashes into the station the train can be clearly seen on the rails inside the station (why there are tracks inside the station behind a wall not connected to the rails outside is strange enough) in one shot, when the characters leave the train the tracks can no longer be seen.
As the prisoners are being transferred from Santa Anna Prison to the bus, the shackled inmates are shown dragging their chains along the ground. One of the inmates is dragging an open leg iron.