Question: When The Doctor shows young Kazran his future, older Kazran touches his younger self. He did this without an explosion, however, in 'Doctor Who' it has been said that 'if you touch your younger self, it will create an explosion'. How did the older Kazran, in this episode, touch himself without an explosion?
A Good Man Goes to War - S6-E8
Question: How did Lorna know Amy's daughter's real name in order to make the prayer leaf?
Chosen answer: It was written on the plastic bassinet. She could have seen it or asked at any time Amy was their prisoner.
The Impossible Astronaut - S6-E2
Question: Why didn't Sarah-Jane Smith get invited to the Doctor's death? Wasn't she one of the doctors favourite companions?
Chosen answer: This is an instance of the Doctor interfering, albeit indirectly, with his own timestream. He sends the invites to his younger self, Rory, Amy, River and the older Canton because he knows, from his memories of those events occurring, that they are the ones who get invited. It's a somewhat circular situation, but that's time travel for you.
A Good Man Goes to War - S6-E8
Question: Between the classic and revived series, has River Song's parents been mentioned or hinted before? If so, what was said about them?
Answer: We find out who River's parents are later, but, eh, spoilers.
Chosen answer: They have not.
Chosen answer: It creates a paradox, which isn't always an explosion, but can be. And it doesn't do it in this case for the same reason that the controls no longer operate for Kazran: The Doctor's intervention in his life has caused him to not be the same man he was before.
Captain Defenestrator