When Jon and Davos are walking down the stairs, their shadows are on the left rail, but when they approach Missandei, their shadows change position and are now in their back.
The Lannister army attempts a defensive position of overlapping shields, but this would not have been used by an army with the shape of shields used by the Lannisters. To be effective, the shields must have straight sides designed to interlock.
All the wagons around Qyburn's scorpion are burning, but not the wagon carrying Qyburn's scorpion. It was clearly not fireproof.
A reverse shot shows Jaime drawing his sword with his right hand. His right hand was cut off several seasons ago.
Missandei is confused that Jon's surname is Snow rather than his father's (Stark). When it is explained to her, she replies that, since the custom of marriage does not exist in Naath, the concept of bastardy also does not exist. However, as Missandei was kidnapped at a young age and spent most of her adult life in Essos, it is doubtful that she is unfamiliar with the concept of illegitimate birth and its consequences.
Bronn fires the first scorpion arrow into the Dothraki soldier. In the next shot, he opens the wagon and rigs the bow arms to shoot at the dragon. However, the scorpion would not function without the arms.
When the Dothraki general speaks Dothraki to Tyrion, Tyrion seems to understand, although he does not speak Dothraki fluently.