Casey and Robin push a jug of water into the kitchen for the upright water dispenser, and Casey just picks up the old bottle right out of the top of the dispenser with no effort. Once out, you can see that the rubber cap on the bottle that holds all the water in and the part inside the cap where it connects to the dispenser to water can drain out of the bottle, is missing.
Polly reminds MacGillis about the rule of not smoking in the house, yet in "Jane Wayne Day" she says nothing as one of the Marine waives smokes in her house.