First, I'd like to commend Joshua Jackson on that performance. I thoroughly enjoyed him in this episode, and it must have taken a lot of energy to turn bright red like that every time the kid controlled him!!
Also, that last scene where Dr. Carson was rolling Tyler #3 down the hallway, I couldn't help but be reminded of the very last scene in "The Prestige" where there are dozens of water tanks filled with Angier's clones. Very cool that Fringe went that direction.