pretty much... the main one I tend to ask is the 6 falsy values, clarified as needed. The responses tend to be a good overall indicator of how well the person knows JS.
Well, if someone googles it in a live interview, they're pretty much out. It's not the ONLY question I ask, but will guide where the rest of questions come from.
It's (knowledge of falsy values) been a very representative indicator of how well they know the language itself. It's not an indicator of understanding software as a whole, or a given UI framework or library.
Not to mention in general Javascript does some pretty not intuitive things with objects: https://archive.org/details/wat_destroyallsoftware