After Alice pulls the plow at the ghost town, her sweatshirt becomes stained on the front. In subsequent scenes at the ghost town, the sweatshirt no longer has the stains despite mentioning not having water.
After Mike asks Carol what she thinks of Yutahay Flats, which is on the Grand Canyon floor, the next shot is of what they are supposed to be seeing. That shot is of the Grand Canyon from a vantage point not from the canyon floor as it is supposed to be, but rather from the top of the canyon.