Continuity mistake: When The Doctor is shot and killed while trying to regenerate on the beach, he falls with both legs extended. When River, Amy and Rory run up to him his left leg is bent. The camera cuts away again, and when it cuts back to show The Doctor's body one more time both legs are straight again.
Other mistake: After River shoots at the astronaut going into the lake, she drops her arm. The next second, she turns around and the gun is holstered without her having made any movement to do so, and there was no sound made.
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Visible crew/equipment: The astronaut coming out of the lake is seen twice in series 6. In episode 1 "The Impossible Astronaut" and in episode 13 "The Wedding Of River Song." In "The Wedding of River Song" when the helmet of the suit is lifted, the astronaut was revealed to be River Song. However in "The Impossible Astronaut" when the helmet was lifted, a man's beard can be seen. Since it is a man in the suit, then it was just a double seen in "The Impossible Astronaut."
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