The truth is you just don’t know, and you have to go off of hunches - the google panel rejects on hunches all the time, regardless of the systems they put in place to minimize it.
So I guess the problem with objective-seeming (and often just simply gratuitously hard) "filter" questions like those suggested here is that their real purpose seems to be give the process an appearance of objectivity - "We had a guy in here, his code samples looked great, and he talked a great game and all -- but would ya believe, he totally froze on that Lego robot puzzle question! What a poser!" -- when of course it's never going to be anything of the sort.