Jewel Staite's character is named Amy Pond, a nod to the The Eleventh Hour (2010) character who is seen as both a child and an adult.
In the scene where Dean is at the convenience store, the man behind the counter is wearing a shirt of Batman: Under the Red Hood (2010), which starred Jensen Ackles as the voice of Red Hood.
When the leviathan credit card accountant is on the phone with a customer he mentions a charge to "Mistress Magda". In the episode Swan Song (2010) when Dean calls Chuck, he answers thinking it's Mistress Magda.
When Dean calls Bobby to tell him that Sam, "Left me here like Jimmy Stewart." This is a reference to Hitchcock's film Rear Window (1954), where Jimmy's character is stuck in a wheelchair with a broken leg, while his girlfriend checks out a suspected killer's apartment.