When Creech and Don are fighting after their escape, Dr. Smith runs around holding a rock over his head and there is no shackle on his leg. In the next scene, the shackle is back on his leg and Cheech has to break the chain so he can go ahead without Smith.
After Creech, Major West and Dr Smith pass through the mine field, Creech hits Major West over the head with a boulder and knocks him out. The position of Major West's left arm & left leg changes between camera shots.
The prisoners are located in quadrant 5. A quadrant is one of four.