Continuity mistake: When Tyrion is talking to Sandor, his position in relation to the gate changes between camera cuts. In the first shot he is next to the gate. In the second shot he is about 3ft away. (00:06:20)
Continuity mistake: When Ser Jorah tells Dany that her life with Khal Drogo "will get easier," watch the strap of her dress. It moves up and down her right shoulder throughout the scene. (00:03:05)
Revealing mistake: When we see Joffrey get attacked by the dire-wolf, You can see his arm suddenly has padding underneath his jacket. (00:47:20)
Audio problem: When Tyrion is saying he wants to stand on top of the wall, it is an over the shoulder shot, however his mouth doesn't match up with what he is saying. (00:07:40)
Chosen answer: The giants in general spoke little English and seem to generally speak very little at all and in a slow, lumbered manner, much the same as how they physically move. Wun Wun is acknowledging that he is supporting Jon's plan by simply stating his name of "Snow."
raywest ★