The CTX convoy is shown driving to the right, including throughout the tunnel just before the ambush, but then it suddenly switches to the left side of the stripe when stopping at the checkpoint.
For the hijack of the CTX, the hijackers are waiting for the truck as it emerges from a tunnel. This tunnel is there in shots from the ground, but the shots from the helicopter before it lands were clearly filmed elsewhere, as there is no tunnel in sight behind the hijacked truck.
The CTX convoy is shown driving to the right, including throughout the tunnel just before the ambush, but then it suddenly switches to the left side of the stripe when stopping at the checkpoint.
Choi Min-sik (actor Mu-young Park) keeps using the term "Nam Han" (which translates to 'South Korea') instead of the term "Nam Chosun" (which translates to 'South Chosun' - a term used by North Koreans)