Ian's face tattoos change from tiny dots to large dots randomly throughout the episode.
The Native American settlement doesn't show any signs of the crops which they would have been growing.
When Chief Bird asks who is responsible for the Trail of Tears, Jamie tells him "a general named Winfield Scott." While Scott was the General in charge of Cherokee removal he did not formulate or initiate the policy. The Cherokee removal was ultimately the responsibility of President Andrew Jackson, who ordered the removal. A historian like Brianna would certainly know this and have identified Jackson as the responsible party, not Scott, in discussions with her father. Warning the Cherokee of Jackson would also have the benefit that Jackson, unlike Scott, was alive at the time. A six year old Jackson was living with his family on the frontier of North Carolina in 1773.