When Cohle says that he met Errol, it's a reference when he talked with the man on the lawnmower at Pelican Island. The spiel Errol gives Cohle is almost identical to the one he gives the two detectives seventeen years later.
Woody Harrelson gets in an argument over Matthew McConaughey mowing his lawn. Woody Harrelson punches Randy Quaid's character for dancing with another man's wife, saying the line, "you don't mow another man's lawn!"