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.
Character mistake: Season 6, episode 4, "The Doctor's Wife": Idris (the human form of the Tardis) berates the Doctor because the doors of the Tardis open inwards, pointing to the notice on the left hand door which says 'pull to open'. Whilst it is true that police boxes did open outwards, the notice is actually referring to the telephone in the small recess behind the notice. The public are instructed to 'pull to open' the small door to access the phone. Consequently, the small door does open correctly, as in the notice.
Add timeJeff Walker
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.
Add timeMovie Nut
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."
Add timeCasual Person
Revealing mistake: Series 6, episode 9, "Night Terrors". In the scene where the man wakes up on his floor, because his pet dog is licking his hand, we see a few pieces of dog food fall from his fingers - should have been a re-shoot, but all credit to the actor, he knows it has happened and is quick to hide them again.