When he notices that there's someone following them, the helicopter surveillance shot shows no one is following them.
When the Driver is shifting gears, he doesn't have the handcuffs on his right wrist. But at the end of the movie, he is handcuffed to the case.
The passenger handcuffed the briefcase to the Driver's hand without unlatching it from his own wrist. He also didn't unlatch it from the Driver's hand while he shifted gears before.
Errors in geography
While the setting is supposedly an African country, the road they are driving down is a US road with double yellow lines. The trees along the highway are coniferous (pine) trees which do not grow in Africa.