You remind me of "Think Of A Number".

Earths.

Imagine if the information had been mixed up and real!Doctor opened the email only to find himself rickrolled.

I think I read somewhere we would get a little nod to that line, but maybe this episode was it.

And in the fact it only happens because the Doctor remembers to be himself even without hope, and even when he personally stands to gain nothing.

My personal favourite is this exchange:

It actually was quite like "Doomsday" if you think about it, it's just that one would expect everything to boil down to the companion in the end in an RTD episode. I imagine I would've disliked it quite a lot if I had seen it real-time (though probably not as much as Hell Bent).

But just imagine how many of his killings look like on paper:
"Blew up an entire Cyberman fleet."
"Blew up a planet full of Cyberman."
"Drowned a whole batch of Racnoss children."
"Caused a Silent genocide."
Etc,etc.

Never let him count and he'll be fine… probably.

Well, if you're going to "run" with it your going to have to be in a computer program run by aliens first.

Because they're linked.

It also happened at the Vatican, but same principle I guess.

People's relationship with family is pretty inconsistent with how they act with the rest of the world, I've found, frequently. So maybe completely coming out to her foster mum is completely different to how it is for the rest of the world, to her, as she seems pretty comfortable with saying it in other environments.

Scientists (top scientists at that) presumably wouldn't want to aid a Earth-defying threat by continuing to develop technology and the such. And they're not real, maybe they're just pragmatic about it.

But that happened in the matrix, so it didn't really. Will that thing play a role in the device?

On the other hand, it's probably made plenty of people google the guy when nobody except those who didn't want it known actually knew about him before this. So…. a tie?

Did everything every other companion did wrong ever, right. What a guy.

Maybe loteries didn't exist as they would know that could be a problem.

No, he isn't. The reviewer means the scene right at the end where the simulated Doctor realizes he shouldn't give up just because he's not real. He taked out the journal then.

Well, it's too late now. But one day I shall buy them.