1.) Her house in untidy and cluttered, suggesting the chaos and lack of order in their lives/Mia's life. Its messy, neglectful, broken household. The lack of tidiness is captured when Mia is going through the drawers looking for a hammer- objects thrown together, not organised.
2.) Wallpaper in living room- Of a beach:. The wallpaper contrasts with their reality. The beach implies paradise and happiness, something which is far from the truth, so by them dancing in front of the wall is quite symbolic, as it suggests that this is what they aspire to be. This wallpaper can also be the little bit of hope that brings happiness to the family, as it lets them escape from their everyday life. Represents their hope and happiness they aspire to have, trying to create and be something else. But then are faced with their reality- so like both a prison & paradise.