When Efron's character is stabbed by a tree after the dust storm, the branch is stuck in his right side. In a following shot it has moved to his left, and subsequently goes back to the right. The stick then teleports to the other side again.
When Man Two is filling the truck with petrol, the drum is not elevated, meaning it is not possible that fuel is running into the tank.
The full moon was shown at the beginning of the first night. A few shots later it shows half moon.