This really can't be understated. The difference between your how your brain works when you're under the clock and know you're being observed vs. the "natural"

This really can't be understated. The difference between your how your brain works when you're under the clock and know you're being observed vs. the "natural" flow of a calm working environment is tremendous. Anyone of us who's conducting the interview must do some kind of double-checking of obvious mistakes to fairly account for the limitations of the process.