Movie trailers for Sunshine Cleaning

An OK film but it felt more than a little disjointed, contrived and just plain pointless at times. For example, the 1-armed cleaning guy. Why? Is he supposed to symbolise loss or was he just thrown in as a spare babysitter? How about the old woman whose husband had killed himself? Saying something or a cynical but effective attempt to elicit some emotion from the audience? I'm really not sure what this movie was trying to say, such were the numerous scenarios, which makes me question it's motive instead of it's motif which was incoherent.
Having said all that, I thought the scene underneath the train tracks was a brilliant metaphor for someone grieving and wanting to connect with the person they've lost. Adams and Blunt in particular are outstanding and totally believable as sisters.