Continuity mistake: Echo is covered with plastic wrap from head to toe, but in both scenes where she wakes up the wrap is only up to her eyebrows and it didn't disturb the needles in her forehead, when the plastic wrap was removed.
Trivia: Before Dollhouse, Olivia Williams had a bit part as Moira McTaggert in X-men 3. She was showing a patient who had no conscience. Xavier then brought up the ethics of placing the conscience of one person into another which is what Ms. Williams does now as Ms. Dewitt in Dollhouse.