When Ross and Rachel are in Rachel's apartment, standing in the kitchen they are discussing not having sex anymore and what a waste it would be. Ross says, "I hate waste." The next reverse shot with Ross's back to the camera, you can see him completing the mouthing of the words "I hate waste" even though he already said that in the previous shot when Rachel's back was to the camera.
When Monica removes her coat after Erica leaves the kitchen, she drops her scarf on the ground and doesn't pick it up through the entire scene. Monica leaving any piece of clothing on the floor for more than a few seconds is unlikely.