I have only failed one technical interview in my life, and to be honest I did not fail it, I took the confidence route which put off the 20 something lead I was interviewing with and mentioned that I was a keynotes speaker at IBM Impact on the coming transition to Javascript based applications. He took this as an affront and challenge (to be brighter than the IBM speaker guy to his team) and ensured that the interview was a miserable experience, but that is neither here nor there The only reason I toot my own horn is to relay the following observation.

The point I want to get to is: I have a buddy who I have dragged along with me (many times staking my reputation on his abilities), to every engagement I go on and this guy could not pass a how to use Microsoft Word interview. He has Aspergers and locks up and fails miserably in the interviewing process, but the honest, reality is, he is 10 times the developer I am, the guy sees patterns instantly and has a knack for code organization. He can master a new technology in a week and is hands down the best developer I have ever met.

That being said, over the years watching him has lead me to the conclusion that it is indeed the ones they hold faith in the technical interview are actually the ones that are the most stove piped and only see the world thru their limited experiences. It should be classified as a form of confirmation bias.