The position of Jon's body on the table keeps changing, most easily noticed by the way his head is placed between shots: sometimes it is completely on the table, while in others, his head is nearly half over the edge.
Jon's body is shown with seven stab wounds, even though he was stabbed six times.
Yara claims that her brothers Rodrik and Maron were killed on the same day during the siege of Pyke. Maron was indeed killed during the Siege of Pyke, but Rodrik was killed earlier and on different battle - at the battle of Seagard.
When Tyrion frees the dragons, he pulls out the pins of the shackles with one swift move. A metal pin of that size however is so heavy that it would be impossible to handle with one hand, let alone slide out so easily out of the even heavier shackles. The shackles are obviously lightweight props.