Bruno said "There is a clue buried in that final sequence that will pay off big time
in the finale of the Red John story. A very big clue. No one will get
it from the clue as it is laid out in the episode, but it will pay off
later."  We were looking for it in wrong places. It was simple.
It was Partridge's words "Tyger, Tyger"! We couldn't understand the situation in that episode but in 6x04, with Kirkland's explanations, it got some meaning and it's been unfolding since then. Of course, it will have a connection with RJ because he already had uttered this word in the third season finale. I think it's not curtains, 666 or else. It's a useless clue right now because we already know "Tyger Tyger" but I think it was the clue Bruno had mentioned.