This story is hardly what you'd call original. Troubled teen whose parents go to desperate measures to change, creepy suburbia and children forced into being good are hardly new themes but the story makes them work. The lead actress is great as is her sister. The close bond between them seems tight, until we see the bubbling resentment underneath. The ending is suprisingly shocking. Teenagers becoming trees actually becomes disturbing rather than slighly amusing. And the families apparently nonchalant reaction makes it all the more unnerving.
Unusually, this episode seems to have no clear moral message. I thought it would be 'You can't stop creativity and rebbelion', though that is exactly what this community is doing. In a sense, it is more of an outright creepy tale rather than one with a moral.