at aprox 50 minutes into the episode, (with comercials) Dr. River Song is in Amy Pond's house, and looks at a picture of Amy and Rory. This should not be possible, because Rory entered a crack in time and space and was erased from reality, meaning he never existed. If he never existed the picture would not either
Not a slip-up because it is stated that if you remember whoever enters the crack they can be brought back to existence, (thats how the Doctor returned). The fact that Rory is one of the plastic warriors proves that subconciously she remembers him.
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