Yeah, if they were going to go that whole route they should of given the hooker sister a hunch or limp. And why is the other sister deranged? Oh, that's right, crazy hair must mean she's crazy. What they should of done with that is cast the super-hot-blue in the role of the house sister and the fuggy blonde chick as the street walker with the mismatched titties.
Someone needs to do the exact opposite of this. Someone needs to take something dark and gritty, and remake it where everyone is well-adjusted and happy and solving minor problems with peaceful methods. It should be done explicitly to spite people who make movies like this one.