At one game back in the early 1970s, Iowa was ahead by a few points in the last minute of the 4th quarter when members of the band noticed that the stadium clock had not started when play began and failed to start for at least 15 seconds. Soon the whole band, which sat directly behind the team in those days, was pointing to the scoreboard and yelling at the officials, "THE CLOCK, THE CLOCK...." This led to one of the oddest comments ever made during a radio broadcast when Jim Zabel informed the listeners, "The officials are now conferring with the Iowa band director."
Anyway, the clock was corrected, and we were informed that the authoritative time was kept by an official on the field and that the scoreboard clock was not official.