When Dante looks at himself in the broken mirror while wiping off his stage makeup it references the scene in The Crow where Eric Draven paints his face in the mirror he smashed before he sets out looking for vengeance.
Garcia tells JJ that she managed to gain entry into a vampire fan's laptop by guessing that the password was Cullen, a name Reid isn't familiar with. JJ then tells him that the Cullens are the vampire family from Twilight, to which Reid asks her what Twilight is.