The Snowmen - S7-E7
Continuity mistake: When the Intelligence in Simeon's body is attacking the Doctor, the Doctor's left arm goes from pushing at Simeon's right shoulder to suddenly stretched along the floor in a shot from above. (00:54:48)
The Snowmen - S7-E7
Continuity mistake: When Clara tests the solidity of the cloud the TARDIS is parked on, her right hand suddenly jumps to the railing of the staircase between shots. (00:18:14)
The Snowmen - S7-E7
Continuity mistake: When the Doctor offers Clara a TARDIS key, he's holding it differently between shots. (00:44:35)
The Snowmen - S7-E7
Continuity mistake: While confronting Dr. Simeon in an alleyway, when Vastra picks up some snow and remarks about how interesting it is, the fingers of the hand she's holding the snow with change from being extended to curled up and back again between shots. (00:08:58)
The Snowmen - S7-E7
Continuity mistake: When the Doctor is explaining what the intelligence in the giant snow globe is, though enclosed, the amount of "snow" alternates from a fair mass to a few handfuls and back several times.
The Snowmen - S7-E7
Continuity mistake: As Clara first realises the differences in the TARDIS exterior and interior, she goes to circle the outside, leaving the door open. A second later, it's closed, but open upon her entrance.
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 after everything the Master's put him through hurts him more deeply than death would.
Captain Defenestrator