i'll try...
- the overlook was built on a sacred native american burial ground, and many native americans died trying to prevent it from being built. this is mentioned specifically in the movie: the white man taking the land from the native american--and is treated as a joke by the ullman character.
- alcoholism is a real problem in some native american communities. note when jack takes his drink he mutters "white-man's burden", a reference to that very issue. alcoholism is also what drives the horror in this movie.
- the walls of the overlook are covered in indian rugs and artifacts. in the main room where jack tries to write, you may notice a large rug with what looks like a line of native american spirits on it, as jack bounces a ball off of it.
- use of the axe (in the book it was a mallet) as the killing weapon in the movie could be a reference to the tomahawk.
- there are many little details, such as "indian head" logos on the boxes in the kitchen, etc.
keep in mind that everything in a kubrick movie is there for a reason. there is not a square inch of image on screen that kubrick did not intend. to me the native american subtext has slowly evolved over repeated viewings. think of it: why all the native merican imagery? why does a place have a special, spiritual meaning (the overlook hotel)--these are things that are part of some native american cultures.
now remember, this is what i call a "subtext", or a theme that runs beneath the main themes, which are (1) a place can be evil and (2) an abusive father/husband. it is not something that kubrick makes obvious, but that is why his movies are so wonderful. i always notice something different each time--a new level if you will.
this is my take on it, and i may be wrong, but watch the film again and see if you agree.