Amanda moves into the apartment above that of Billy and Alison. Previously, he was occupied by Rhonda whose departure is not mentioned. Presumably she moved after Terrence's marriage proposal.
After Keith deliberately bangs his head on the TV, he's bleeding from the middle of his forehead, high up above his nose. Later, when he sees Alison, he has a bandage above his right eye, with a little bit of a black eye as well.