From the NCAA rules, section FR-77: "While in the process of substitution or simulated substitution, Team A is prohibited from rushing quickly to the line of scrimmage with the obvious attempt of creating a defensive disadvantage. If the ball is ready for play, the game officials will not permit the ball to be snapped until Team B has placed substitutes in position and replaced players have left the field of play. Team B must react promptly with its substitutes."
I believe Dooley harped on this rule during and after the LSU game. Tennessee was not given time to substitute on the last play of regulation in the LSU or UNC game - obviously our personnel would be different on a "passing play" (spiked ball) than on a field goal attempt. The umpire should have prevented UNC from snapping the ball, and the clock should have ran out. The game should have been over. Dooley after the UNC game: "It was chaos again, they run a bunch of guys on the field and nobody - the umpire doesn't jump up to stop and allow a substitution. They allow them to snap the ball and they get a penalty. That allowed them to bring their field-goal team on and kick it with one second. I don't know what else to say." Of course, I (and Dooley, JD) could be wrong, and I'd like to hear an NCAA official explain this.
Article 3: " The game is ended and the score is final when the referee so declares."
Tim Brando (CBS Sports) on Twitter: "the Referee officially called it OVER! Replay booth can take control of a play, but he can't overturn the game called over!" ... "The college game is losing credibility at every turn on every issue, and frankly after the officiating at the Music City Bowl it's deserved."