Whilst at dinner with Roose Bolton and Brienne, Jaime is initially seen in closeup attempting to cut his meat with the side of a two-pronged fork, but in the wide shot, the fork has changed to a knife. In the following wide shot, he is once again holding the fork, and is then seen setting it aside and picking up the knife instead.
When Jon and Ygritte reach the top of the Wall, there is a hook with a line on top of the Wall. It makes no sense as they have been climbing up and opening the way as they went, that would make sense if they were about to descend or otherwise somebody put it there for them to climb, which is not the case.
Theon's captor blows the horn wrongly, by putting the whole mouthpiece in his mouth.
After a piece of the Wall falls off and Orell attempts to cut loose Jon and Ygritte to let them fall to their deaths, there is a quick close-up shot of him trying to saw through his rope with the dull edge of his knife.