The clip exists because WSBK-TV in Boston, then an independent station, was the television flagship of the Boston Bruins. WSBK had a weekly program during the season showing highlights of the previous week's games. WSBK got permission from CBS to simulcast the game and to tape the network's telecast and use highlights from that it for the next week's show. WSBK decided to show the entire (however brief) overtime session in the final 1969-70 edition (aired on May 17, 1970) of "Bruins Highlights", as well as in "Boston Bruins: World Champions", an hour-long documentary featuring highlights of the team's 1969-70 season and Stanley Cup win. Coincidentally, WSBK is now owned by CBS, run as a sister station to WBZ-TV (formerly owned by Westinghouse Broadcasting as an NBC affiliate).