I've been posting this around, and believe it is an editing error:
When Buffy is backstage looking for Sid, she makes the comment "The demon's got itself a brain," and then later tells Sid "Now you'll never be human."
Willow had just come up with the "demon collecting body parts to become human" theory in the previous scene, by which time Buffy had already gone hunting. The viewer knows about the theory, but it is unexplained how Buffy knows about it.
Is this a valid addition? Cinemastique 09:08, December 24, 2009 (UTC)