In one scene, Joe Leaphorn holds the blade of his knife against Colton Wolf's forehead skin. In the close-up, he's holding the knife about an inch into the hair over Wolf's forehead.
One of the Tribal Police vehicles shown is an International Scout II. From the brief glimpses earlier in Season 2, it appears the truck is a 1972 (year specific grill)... Later, the Scout grill is seen close up, and it is different. It is a 1976 grill. The series is set in 1973, so, that would be impossible.
Before heading to the crash site, Bernadette asks Agent Whitover what he's carrying for a weapon. Whitover replies that he has his .9mm. In 1971, FBI agents would still be armed with .38 caliber revolvers. .9mm weren't issued to Special Agents as sidearms until after the 1986 FBI shootout in Miami.