When a man comes into the tower to tell the Doctor about the arrival of the Daleks, he replies saying: "It's okay Barnable, don't worry. I have got a plan". However, when the man leaves, the Doctor secretly tells Clara: "I haven't got a plan, but people love it when I say that". Since he was still inside the "truth field" that covered the entire town, he shouldn't be capable of lying at all.
This episode makes a point that the Doctor is out of regenerations, counting the War Doctor and the Tenth Doctor's regeneration into himself towards the end of Series 4. However, in "The Impossible Astronaut", it was shown that the Doctor was killed for real since he was killed during his regeneration. Of course, it was revealed that that wasn't really the Doctor in "The Wedding of River Song", but it still suggested that he had another regeneration left.