Some other things that made me go
: It seemed like they all just waited around for the Jenny-thing to catch them. They all had plenty of time to get into the TARDIS.
Except the TARDIS was half buried for most of the episode, remember? Hard to dig through six plus feet of acid-soaked dirt to open the TARDIS door, if you ask me.
And how convenient - the door doesn't lock, and what, all of a sudden the sonic can't bolt the door?
I personally assumed it was because the door physically didn't have a lock - bolt or otherwise - as opposed to the lock being jammed and just needing a sonic-ing.
The balloon and the blood clot cure in a vial were totally hokey. "Oh look, I keep a red balloon handy, and oh, here's your miracle cure right here next to the red balloon". Which makes the fact that he couldn't save a supposedly drowning Rory a couple of weeks ago stand out even more starkly.
The clot cure I'll concede, but the balloon isn't that much of a stretch for this Doctor, I don't think. I mean, the Doctor has carried some pretty random things in his pockets over the years. And balloons? Very Eleven.
Dissolving the Amy ganger seemed to me a dumb idea - that was his only link to where the real Amy might be. With that gone, how would he even know where to start looking for her?
Maybe he wanted the real Amy to be properly conscious for childbirth?