This week’s episode of Roseanne (ABC, Tues., Aug. 27, 9 P.M. ET), a rerun from May, is memorable not just for the inspired casting that introduced Shelley Winters as Roseanne’s wry grandma. A very special moment comes at a barbecue as Roseanne’s coffee-shop coworker Bonnie Sheridan breaks into song, a stirringly soulful version of “You Really Got a Hold on Me.” You may recognize that dusky contralto; 20 years ago Sheridan (then using her married name, Bramlett) was the better half of Delaney and Bonnie, whose mix of R&B, country, rock and gospel attracted hangers-on such as Eric Clapton and George Harrison. By the way, Sheridan wasn’t the only former singer on Roseanne this year. In one episode coffee-shop manager Martin Mull had a gay lover played by Michael Des Barres, a solo act and member of the group Detective in the ’70s. He’s probably best known, though, as the ex-husband of rock’s most famous groupie, Pamela Des Barres, author of the colorful memoir I’m with the Band.