"Vladimirov's thunderbolt of 1987", as mentioned by Holt, is an actual chess move. It is ranked as the 4th best move of all time by chess.com.
150th episode of the show. The Texas Boyles previously appeared in the 99th episode, 99 (2017), which the show commemorated in place of the 100th episode.
When explaining his belief that Pappy Boyle was murdered, Jake states that, "the game is afoot." This is a popular catchphrase of fictional detective Sherlock Holmes.
Boyle is called the "coffin cousin" but when he brought out the "coffin" he was actually showing a casket. Coffins are shaped like a vampire's coffin with a widened area where the elbows would be. A casket is shaped like a rectangle.