"Rosanne" is one of Leonardo DiCaprio's first acting gigs ever. He had made a few brief appearances in television series like "The Outsiders," "Santa Barbara," and "The New Lassie" between 1989 and 1990, along with his notable supporting role in "Parenthood." However, in 1991 he would take a very brief part in Season 3, Episode 16 of "Rosanne." The episode is titled "Home-Ec” and follows Roseanne (Roseanne Barr) as she teaches her daughter Darlene (Sara Gilbert) and her friends in her class how to be a good homemakers per a request from the school. During the scene just before Roseanne takes Darlene and her friends to the grocery store, DiCaprio can be seen as one of Darlene's classmates, sitting at a table with her.
We don't blame you if you didn't remember, as it happens so fast that his face is easily missed. Despite the brief appearance, the "Roseanne" credit on DiCaprio's resume opened him up to even more acting opportunities. He's certainly come a long way since his sitcom days, as he's working with Martin Scorcese again for "Killers of the Flower Moon," but is also attached to the "Roosevelt" drama at Paramount with the director as well (via Deadline).