When talking to the surviving brother at the beginning, Dean introduces himself and Sam as "Detective Plant and Detective Page." If you look closely at Dean's ID, it says Detective Robert Plant. Robert Plant is the lead singer and Jimmy Page is the lead guitarist for the band Led Zeppelin.
This episode centers around fairy tales coming to life, specifically Grimm fairy tales. However, the version of "Cinderella" referenced in the story (pumpkin, mice, Cinderella imprisoned) comes from the French version by Perrault. Grimm's version contained none of those elements.
The Crossroads Demon at the end of the episode mentions that Ruby is "such a pain in my ass." Ironically, that demon is played by Sandra McCoy who was Jared Padalecki's girlfriend-soon-to-be-fiancée at the time. The irony is, after ending his relationship with McCoy, Padalecki married the actress who played Ruby 2.0, Genevieve (Cortese) Padalecki.