Dean uses the alias Ashley J. Williams. This is a reference and the full name of Bruce Campbell's character in the The Evil Dead (1981) series.
The Stynes' house is the same one that is seen in The Third Man (2010), when Sebastian Roché makes his first appearance as Balthazar. As Castiel, Sam and Dean approach his home Dean says, "I was expecting more Dr. No, less Liberace."
Various rock aliases found on Deans fake IDs: Ozzy Ozbourne from Black Sabbath, Lemmy Kilmister from Motörhead, and Freddie Mercury from Queen.
Dean's contact name in Crowley's phone is listed under "Not Moose."
When Dean is arrested in Shreveport, LA, he calls the deputy "Cletus." Cletus Hogg was a deputy on the 1970's TV show The Dukes of Hazzard (1979).