Don't understand why each swap isn't between families with exactly the same dynamic and number/age of kids?
Single parent and 3 older teens/ a 21yr old = totally different to that of 2 parents and 1 working, mid-20s DD.
Far from a taste of each other's true lives there, re the basics:
e.g. RichGirl (feels very odd calling a 26 yr-old woman that!) doesn't get to experience the reality of 5 people sharing a (to her) small living space/ reduced privacy in shared bedroom with sibling/ the daily joys of queuing for single bathroom etc.
Another family of 5 would have done. Much more interesting.
Really liked NotRichMum...nice personality 
Working 3 jobs, whilst raising 4 kids...
or
for you!
Doubt the programme makers will, but would be so useful if a later episode mentions how death of a spouse/ illness/ disability etc. has impacted on a family's choices, employment and thus current financial situation.
Would offset the myth that lack of wealth = simply down to lack of hard work and ambition, or living over budget...
(Am sure the dog poo was simply down to last-minute run in the garden before car trip to RichHouse, and accidentally went unnoticed?).