When Shawn and Gus are singing and dancing for Yang over Skype, the music playing is from the "Dazzle and Stretch" song Shawn made up when he gets a "vision" about an actress in "9 Lives".
When Gus is telling Shawn he needs to start taking more risks, Shawn asks if that means they can go cliff diving in Zihuatanejo. Zihuatanejo is where Dufresne and Red end up.