Patience Wright is summarily executed, but in reality, she survived the war and died in 1786 after a fall.
In S02E01, a man in England
claims he has a receipt from the ship Margaretta, when in fact, the Margaretta had already been taken in Machias Maine, by rebels on June 12th, 1775.
The room where the occupants of the King's chamber are ushered out to while he is having a fit is actually the ballroom of the Governor's palace in Williamsburg, Virginia. It is notable for the distinct carpet pattern and portraits of the King and his wife on the wall. When the door opens you can briefly see another room that is different from the chamber the people supposedly just left.