I watched it for the dozenth time the other day and noticed something
The matches that Chen steals from Namgoong. Chen uses them to light the fire for the torches. But, he is never shown giving the 2 matches that are left back to Namgoong. Later in the film, near the very end. Namgoong gives the last cigarette in the world and the second last match to Curtis. He later uses the last match to light the bomb.
But, what I don't understand is how did Namgoong get the matches back from Chen? Chen stays in the back of the train. He never meets up with Namgoong and Curtis.
Did anyone else noticed this (extremely small) mistake?