Originally Posted By: thedoctor
It's a bit of the wishy-washy timey-whimeyness as Rory is human again but has Auton Rory memories. It is, quite frankly, the weakest part of the whole story. Yet, it was so entertaining getting to that point that I don't really mind it.

I watched it again. The Doctor told Amy that when they took a snapshot of her memories they got "more than they bargained for" and Auton Rory got Rory's soul.I think the implication is that the cracks don't erase events just memories and most evidence (there was still a picture of Rory in the book and the ring still existed and Amy was still there despite her parents being gone). Her link to the crack allowed her to be an anchor to bring things back. So she didn't need to remember every detail of the Doctor, she just needed to remember him and he came back from the other side.
How about the paradox of the Doctor only being let out of the Pandorica because after he was let out he went back and gave Rory the screwdriver but only when Rory told him he was dressed the same as he was when he went back to give him the screwdriver. Or Amelia getting the notes from the Doctor because she showed the notes to the Doctor and he went back and rewrote them to match the notes he'd already given her.
The only thing that bugged me was the Doctor and Amy touching their past selves. It's been established since Pertwee that's a problem and in Father's day it created those dragons who tried to eat the church. Even in this episode the screwdrivers sparked when they touched. Technically you could argue that Amy wasn't the "same" because after 12 years every cell in her body would've shed and been recreated but still.

Bow ties are coool.