As someone knocks on the door, Betty drops her bowl of cereal leaving a mess consisting of milk, "Fruity Munch" cereal, and shattered ceramic on the floor. When Betty walks forward to open the door, the floor behind her, where there should be a huge mess, is totally clean.
At about 15:15, Alice and Chic are shown playing the board game "Clue". They must be super intense gamers, though, as playing Clue (by the rules) with only two players is pretty much impossible.