In the final scene, the four stranded crew members (Tripp, T'Pol, Mayweather, and Crewman Cutler) walk towards the recently landed shuttle craft. The grassy clearing they cross has obvious lines cut back and forth across the grass from being recently mowed. Yet the planet was earlier described as being uninhabited by any higher lifeform nor has any technological equipment.
As they leave the shuttle after landing on the planet, a house appears to be within the trees in the background to the left.
The clearing in the closing scene shows lawnmower lines.
When Trip is shouting at T'Pol in the cave, all of his lines echo except one, which not only sounds different but is missing the echo (because it was re-dubbed in post-production).