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 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: 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 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: No, no information is avalible for the identity of the entity.
Repo_Man