Which details does Talty include in "In a Jar" that make clear to the reader that David's life before the reservation did not include many other Native people?

When David first meets Frick, he notes that Frick has dark skin like his mother's, which hints that darker complexions are unusual enough for David to make note of. This is confirmed when Frick begins to speak in their Native language, and David finds it strange to hear the language from anyone other than his mother, sister, and grandmother.