Owen Wilson's Black Nail Polish?
In the golf cart scene, when Fred is "petting" his friend in the golf cart because they're stoned #Dove, in several clips during the petting and then while Gary is in the pond on his cellphone with the guy who cleans his office, Owen Wilson is clearly wearing black nail polish, definitely on his thumb, perhaps on the rest of of his hand, I thought at first glance, nah and then positive but thought maybe he had hurt his thumb and the fingernail was about to fall off, but it looked too shiny.
Very strange indeed.