Character mistake: Trivette hands the man in yellow a bullet recovered from the plane Walker and Alex were traveling on, which was shot down by an assassin flying a P-51 Mustang. This man, and later Trivette, mistakenly refer to the round as a "50mm," when in reality, Mustangs were equipped with M2 Browning .50 Caliber (12.7 mm) machine guns.
Continuity mistake: One of the men attempting to kill Walker holds up his AK pattern rifle after one of his crew members is killed. If you look at the rifle, you can see that the safety is on and as a result, would not fire if he squeezed the trigger. Before and after this shot, the safety is seen in the off position.