When Devon is driving the rail vehicle, tire tracks from previous takes are clearly visible ahead of the vehicle.
Adair and Danziger are tied up with vines and can't move. The next time you see them they are free and have walked some place else. How did they untie themselves?
When Danzinger and Devon are stuck in the rail vehicle, Danzinger goes to place the rock under the tire to get extra traction. He momentarily places his hand on the tire as he bends down. When he does so, the tire starts to turn, revealing that the vehicle has been jacked up to prevent it from having any traction.