I get that the referee should be the judge of how much time is actually left in a match, I don't understand why it's allowed that the scoreboard/game clock is not synchronized with the official. Players and coaches need to have confidence that the time on the scoreboard is accurate. This could have cost BYU the game...

http://www.heraldextra.com/sports/college/byu/other/byu-men-s-rugby-holds-off-cal-in-final-seconds/article_ae5cda26-edae-5091-a4f9-9081a749b3f6.html