A poker hand of two aces and two eights is called a 'dead man's hand'. Legend has it that when Wild Bill Hickock was murdered during a poker game he was holding two pair, aces and eights, all black cards - the fifth card not specified.
Chance McGill (Lance LeGault) mentions the ranch covers 50,000 acres. That converts to 78.125 square miles.
Sam (Doc) and Tess dance to Hank Williams singing "Cold, Cold Heart" (1951).
This episode establishes that animals can see and hear Al.