Towards the end of the motorbike scene, Matt performs a wheely and overtakes Echo. In the following shot Echo is in front of him again.
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.