When Luke lines up for the final putt, he changes putters. As fourteen clubs are the maximum allowed in one player's golf bag during a round played under the Rules of Golf, it would be very unlikely that a professional golfer would carry two putters in the bag in a round.
The morning after a torrential rain near the end of the film, Luke is instructed to bury a box in a small hole dug into the earth. The dirt - whether recently dug or not - would have shown some moisture retained from the storm and would not have been the fine dusty powdered dirt in this scene following that size of a thunderstorm. The hole, too, would have shown some moisture absorbed into the earth.