I thought he had a great point on the technical questions some of the best developers that I have see, don't spend their time studying every trick question for the array of technologies they use, just so, on the off chance that if it comes up in an interview, they we be spot on. It is crazy, and it reflect poorly on the ability of the interviewer to competently understand the task they are trying to accomplish, which is hire a good developer that integrates into the team well, not a jeopardy contestant.