The storage unit that was robbed was rented under the name Edgar Cayce. Edgar Cayce was a famous American psychic and was known as the "Sleeping Prophet" because he supposedly had the ability to put himself in a sleep-like trance before he gave a reading.
The entire episode is about luck. If you look closely in the thugs apartment, there is an upside down horseshoe above the door. Horseshoes are an international symbol of luck. If the horseshoe is right side up, it collects good luck. If the horseshoe is upside down, it lets all the good luck out and invites bad luck.
Wayne and Grossman are playing poker as Sam and Dean are sneaking into the apartment to get the rabbit's foot. Wayne gets four kings, and later on says he got two royal flushes in eight hands. The odds of getting a royal flush are 649,740:1, four of a kind 4,165:1.
The trivia items below may give away important plot points.
Towards the end of the episode, Dean throws a remote control at one of the men holding Sam, hitting him in the face and knocking him unconscious. Dean then says "I'm Batman." Jensen Ackles voiced the character Red Hood in the movie Batman: Under the Red Hood (2010).