A news article from 2012 about Rust Cohle and Marty Hart is seen on Elisa's computer screen showcasing their involvement in uncovering the murders committed by Errol Childress.
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.