On hearing The Grateful Dead on Saturday Night Live in 1979, in what must have been a rerun

From seventh to tenth grade (1976-1979), I was on the Ottawa Hills High School cross-country team. Every fall, we ran a 24-hour relay around the school on a Saturday and Sunday. In October 1979, we watched Saturday Night Live, and somebody commented on the band: "They fired their backup singer and the pianist and replaced them with a pianist with a falsetto." — That was The Grateful Dead; the firing occurred in February 1979. — But the Dead only played SNL in October 1978 and April 1980. So in 1979, we probably saw a rerun of the 1978 episode, with the Dead playing "Casey Jones". That was the first time I noticed them. (Andrew Shields, #111Words, 25 September 2023)