I’ve read it more than a few times over the years ( mine is the first paperback edition from 1984!!!)
I like the style in which the information is presented — much easier to fathom than some of the more esorteric ‘teachings’ by Carlos Castaneda. Also have Millman’s “The Laws of Spirit” which is another nice little tome of wisdom worth the read.
Never got to see the movie… never got to this neck of the woods. :-[