The Anasazi Indians apparently spoke Tanoan, Acoma, Zuni, and Navajo, all Native American languages. However, they seem to understand the healers talking to them in Spanish, a language that is nothing like their languages.
About 40 minutes in, there's a scene in which Kevin Bacon's character closes the garage door after it mysteriously opens, then sees the French doors open. He walks up to close it and you notice, the closed door of the two has no holes for the lock and knob to go into. But the open door, as Bacon's character looks out, has the door knob/lock hardware. That door can't close shut or lock.
Gaffer tape can be seen over the door latch when Gloria opens the door at 1:16:57.