One more Casey-centric bit of trivia: On that same show, from July 17, 1976, Wings' "Silly Love Songs" was at Number Nine, and the Beatles' "Got to Get You Into My Life" was at Number Eight. Casey noted that this was the first time the same singer had had two consecutive hits on the chart with two different groups. I guess Tony Burrows never achieved such a distinction.
(Incidentally, does anyone know the circumstances around the release of the single of "Got to Get You Into My Life" in 1976? What a brilliant and unlikely decision that was.)
I don't know if this feat has been accomplished in the years since 1976, although depending on how you define it, I would guess that there have been guest stars and featured artists on rap singles that ended up back-to-back on the charts. It's just a matter of deference to the judges as to whether someone like Ashanti was recording with two different groups.
I wonder what would have happened if the Number Twenty song on that week's chart, "Never Gonna Fall in Love Again," had landed adjacent to one of those other McCartney-sung singles, since it was performed by Eric Carmen, the Paul McCartney of Cleveland.