In the sequence where Chisty is standing to block the bulldozer, her distance from the bulldozer changes greatly between shots; for example, the brief "from inside the cab" shot shows her much further away than in the previous and subsequent shots.
MacGyver finally breaks into the well at night when it's dark. He places the flashlight down so it is shining upward, yet there is light on his face and head (from the filming camera lights).
At the beginning when MacGyver is about to crash, he inexplicably unhooks his seat belt and jumps from his Jeep. He should know he would be much safer strapped in his Jeep with a roll bar for protection.
Christie and Jacob are down the well for several hours. During that time they would have needed to urinate at least once, yet their pants are totally dry when extricated from the well.
Jacob makes a practice of speaking "totally prim and proper English", but he uses a contraction on at least one occasion.