Nitpick time: Game 6 was played on a Tuesday*, and SNL (they couldn't call it that yet because of another show of that title, hosted by Howard Cosell of all people) had already aired two episodes by then. The debut with Carlin on October 11, and one with Paul Simon on October 18.
*The rain had actually subsided by Monday, but for ratings purposes neither Bowie Kuhn nor NBC wanted to have it in the daytime or opposite MNF that night, so Tuesday night it was. TV has been pulling the scheduling strings for a very long time.