Watch closely the scene where all of the kids except Jan are having a sack-race. Listen carefully to Peter and Bobby throughout the whole scene. Peter CLEARLY says,"Come on, Maureen!!" two different times!!( he says that when he is standing at the end of the yard refereeing Greg and Marcia) It is clear as a bell just listen carefully. Then, Bobby says, "Maureen, GO!" Watch his mouth and you can clearly see that is what he says. (you can hear him too) In case you didn't know, Maureen is Marcia's real name.