It's all good fun laughing at 'women drivers' and a crashing TARDIS (even though the TARDIS is constantly crashing even when the Doctor regenerates into a man).
But if you want to really look at PC imagery, who thinks there was a subtle meaning in the ring falling off her hand?
1) She's simply smaller, so the ring didn't fit?
2) GIRL POWER, throw off the shackles of male oppression and refuse to be tied down with this symbol of male ownership?
I started thinking of that just as a joke, wondering what PC nonsense you could ascribe to anything you see.... but the more I think of it......