Character mistake: 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. (00:23:50)
Continuity mistake: After Rory receives the telepathic message, when he tells Amy what happened, his left hand jumps between rungs of the ladder he's climbing. (00:30:20)
Continuity mistake: When Idris/TARDIS tells the Doctor he's like a kid trying to rebuild a motorbike who never reads directions, her arms change position and the circuitboard she's holding switches hands between a close-up and following wide shot. (00:23:41)
Audio problem: When Idris/TARDIS says to the Doctor "And you don't care that it's impossible", in a shot from behind them her jaw does not move as she speaks. (00:22:49)
Continuity mistake: When Idris/TARDIS starts to run out of the room only to stop, grunt in pain and put her hand to her side, the hand in question switches from her right to her left between shots. (00:20:41)
Continuity mistake: When Idris reveals she's the TARDIS and the Doctor disbelieves it, her right hand moves between shots while it's resting on the bars of her cell. (00:16:32)
Continuity mistake: When Idris/the TARDIS stumbles in the junkyard and the Doctor catches her, just before she tells him that one of her kidneys has failed, her right hand, holding a piece of circuitry, moves between in front of his chest in shots facing him and resting on his shoulder in shots facing her. (00:24:48)
Continuity mistake: As the Doctor talks to Idris/TARDIS, he reaches into his coat. When the angle changes, he reaches in again. (00:18:20)
Chosen answer: The Master knows that deep down, he deserves death for the crimes that he's committed throughout his life, and since he regards The Doctor as his arch-foe, he expects it to be at his hands. The fact that The Doctor is still willing to forgive him for all of his crimes hurts him more deeply than death would.
Captain Defenestrator