When Xander says, "It's a loop... like the Mummy Hand!" he is referring to Life Serial (2001), in which Buffy is caught in a time loop and must battle a severed, magical Mummy's hand.
Buffy says: And what can I say, I just love those evil, evil movies. Like Exorcist, you know, Blair Witch...". She is referring to two critically acclaimed horror films, The Exorcist (1973), and The Blair Witch Project (1999).
Andrew says: "I'm like Vader in the last 5 minutes of Jedi with redemptive powers minus a redemptive struggle of epic redemption which chronicles...". He's referring to the last scenes of Star Wars: Episode VI - Return of the Jedi (1983).