On November 17, 1968, the film's premiere on NBC unexpectedly became one of the most notorious moments in American broadcasting because it interrupted the conclusion of a game between the
American Football League's two top teams—the
Oakland Raiders and
New York Jets at
1968 AFL season. NBC's network management had taken the decision to show the entire game until its completion even though it was contractually obligated to begin the broadcast of
Heidi on the East Coast at 7:00 p.m.
ET; the film's premiere would be delayed by the overrunning game. The number of East Coast viewers calling NBC asking for confirmation that the game would be shown to the end caused all 26 phone lines at NBC's switchboard to fuse. Nevertheless, the film was the highest viewed television program of the week and most watched television movie of all time with a
Nielsen rating of 31.8 rating and an audience share of 47%. It was surpassed as the most watched television film of all time by 1971's ''
Brian's Song''. ==References==