And so begins the conundrum of the playroom. Now you see it, now you don't
Quentin seems even more mentally disturbed than Carolyn. His memories are fragmented and he seems to have blocked the knowledge that Barnabas is a vampire.
David (or Tad) doesn't recognize Julia or Barnabas that seems to add to the mystery. He does the minuet with the ghost of a blonde girl that we haven't seen before. I thought that a possible romance between the two characters was being hinted at but that is never developed further.
The motivation of the girl is certainly questionable, as she lures Julia into a trap.