In the first minutes of the show, we follow S.W.A.T. members into the house. The music playing is "In-A-Gadda-Da-Vida" by Iron Butterfly which pays homage to the 1986 movie, Manhunter (1986), where this exact scenario was first seen. A Good Deal By Mommy and Daddy has replaced "In-A-Gadda-Da-Vida" by Iron Butterfly for the streaming Netflix version.
The closed captioning for the episode reveals that "Poison Whiskey" by Lynyrd Skynyrd was supposed to feature during Sam's fight with the Dean/Shapeshifter, the lyrics even run in full in the captions though a regular dramatic piece of score music is heard instead.
Jensen Ackles also played the brother of another Sam in Dark Angel with Jessica Alba. Also in Dark Angel he played 2 versions of himself Ben/Alec just like in season 1 of Supernatural with the shape shifter.