I dunno.

Possibly the fact that Amy didn't remember the Daleks.

It could have been a playful reference to the classic story "Revelation of the Daleks", where a new race of Daleks were created out of stored bioorganic material. (In many ways, it's actually the opposite story. The existing Daleks exterminated the newly-created ones, a human bomb was used against the Daleks instead of by them, and for some reason there was Alexei Sayle.)

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