The newscast they are watching mentions Scott and Irwin as the astronauts on the moon. That would be David R. Scott and James B. Irwin who walked on the moon with Apollo 15. The mission launched July 26, 1971 and returned to Earth on August 7, 1971.
The moon landing referred to must be Apollo 17, which happened in December, 1972. The Dan Fogelberg "home free" album, which appears in one scene, was also released that year.
This is the first episode for Henry Leaphorn played by Joseph Runningfox. His son on the show Joe Leaphorn is played by Zahn McLarnon, who played a character named Running Fox on 2005 TV Mini Series Into The West produced by Steven Spielberg.