When The Doctor tells the Ice Warrior to halt, his arm is extended straight in front of him, but in the reverse shot it is bent at the elbow.
Around 17 mins 30, the sergeant is facing Jackdaw as he talks, but in the next shot he is looking at Vincey without moving his head.
(Around 14 minutes) Vincey puts his hand on Jackdaw's shoulder but in the next shot it is on his back. We then see a shot from the front in which Vincey's hand is seen moving down Jackdaw's back from his shoulder.