England is seen taking part in the Peace Treaty of Westphalia. In truth, England did not. England never took part in the Thirty Years' War, while its role in the Eighty Years' War had ended decades earlier.
During the Westphalia negotiations (set in 1648), the French representative says he thought Luxembourg was Belgian. Belgium didn't exist as a state until 1830.
The French representative in Westphalia wears the French tricolor, which didn't exist in 1648.
During the Battle of Hastings, the army of William the Conqueror is marked as "France". However, William was duke of Normandy and his troops only came from Normandy.
The sketch about Westphalia shows France and Sweden at the same table. France and Sweden negotiated their peace treaties with the Holy Roman Empire separately: France did so in Münster and Sweden did so in Osnabrück.
At the end of the Westphalia sketch, the present parties divide the Balkan peninsula. The Treaty of Westphalia had nothing to do with that area, since most of it was under Ottoman control.