Possibly crucial detail everyone missed...
At the beginning of the "dangerous hombre" long take, one can clearly spot Katherine Waterston among the cult members. I haven't heard this being brought up anywhere else, so I thought I might as well share this. I can only guess at the significance of her appearance, unless I'm just seeing things.
Also, Inherent Vice is one of the masterpieces of 21st century American cinema, and Anderson's second best work after The Master (in my humble opinion).