Dean comments that Shane is like a real life Kenny. This is a reference to the show South Park (1997) in which a running theme in the show is that one of the main characters Kenny is killed off in each episode but returns to life in the next episode.
As Sam and Dean sit by Shane's body in the motel, Dean remarks: "I feel like I'm sitting a shiv'a". A "shiv'a" (Hebrew: "seven") in Judaism is a seven-day mourning period during which the first-degree relatives of the deceased are gathered at one home to mourn and receive visitors who come to comfort them, usually while sitting on low chairs or on the ground (hence "sitting a shiv'a"). But a Jewish shiv'a starts immediately after burial, and not while the body isn't buried, as it was in this scene.
Sam and Dean use the aliases Bonham and Jones, a reference to John Bonham and John Paul Jones from Led Zeppelin.
When the state trooper radios in to report finding the body he uses the unit ID Seven Mary Four. On the television show CHiPs (1977), Seven Mary Four was the unit ID for Officer Frank Poncherello, played by Erik Estrada.