I too listened to the Podcast, and i was under the impression that Jorge Garcia (Hurley) was talking about Libby and Hurley's first interaction while they were doing laundry. I don't know the episode number, but i think more footage was filmed for THAT episode, not this one. All that to say, i do agree we'll see a lot more of their relationship in this episode. Possibly their past interactions in the institue? Who knows.

As far as Dave goes, i think it was the guy (not sure of his name) who Hurley goes to after winning the lotery and asks about the numbers who originally told Hurley about the numbers (the connect-4 guy). NOT Dave. We'll see in a few short hours i guess!