Other mistake: When Bonham starts his search for Hallam in the forest we see him crawling along with his face and shirt nice and clean. From one shot to the next his face is covered with movie dirt, and his shirt looks as if he hadn't changed it in at least a year. Fresh dirt looks different. (00:27:25)
Other mistake: On the final hunt, both Bonham and Hallam sit down and produce knives in a very diligent manner, Bonham from a flintstone, and Hallam from a piece of scrap metal in a complete forging procedure. Given the time pressure both opponents are under, this display of stone- resp. iron-age skills (a.k.a. survival skills) is a bit absurd and almost touching. (01:13:50)
Other mistake: Once dropped off by the FBI helicopter Tommy Lee vomits and says he is afraid of heights and hates to fly. After Del Toro is detained and on the way to the tunnel, Tommy Lee claims he doesn't like flying and has an 8 hr drive back to his cabin. Next scene is him waiting in a airport presumably for a flight when he hears the report of the truck roll over.