The Battle of Tewkesbury happened in May and yet when people speak you can see their breath. Even in England in May it would not be cold enough to see your breath when you speak.
When Elizabeth tears up a parchment and then tosses it on the fire, a closeup of her hands reveals that her fingernails are clearly artificial.
When Anne goes to Isabelle to go visit their mother Isabelle tells her to shut up. The expression would not come into existence until the 1800s.