Cassie's anger at Edna over her father's 5 year absence does not fit with Irv saying he kept in touch with Cassie twice a year in a previous season. He did not even know she was married with a child.
Amy enters the kitchen asking Andy if Ephram is in and learns Ephram is in the living room. She arrives in the living room to find Ephram on the piano playing Rachmaninoff. The room is not soundproof, so she would have heard the piano from the kitchen.