At one point, John and Brooks are looking at tracks, and he tells her they are either horse or cow tracks. However, anyone who grew up in the country would know that you can't make that mistake: horses have a one-toed hoof while cows' hooves are two-toed, also knows as a split hoof, divided hoof, and cloven hoof.
When the dune buggy flips, the hands the supposedly dead driver can clearly be seen still steering.