The word AHO keeps being used as a tribal hello greeting. Aho is a Lakota Sioux word meaning 'it is good' and is often used as an amen following statements or prayers.
Matthew traveled to Washington, DC with the family. He left on a moment's notice. There is no discussion about who is taking care of the large herd of cattle he just brought to town. Correction: He very specifically says Jon (Ingrid's brother) can watch his cattle.
Dr Mike uses the word 'genocide' to describe what will happen to the Native Americans. However, the word 'genocide' was not conceived until 1948.
It is not explained how Sully knows his way around a pool billiards table. They don't have one in their Colorado town.