I have always wondered who this one extra is and if has a connection to Roseanne. He was in several episodes in the last couple or few seasons. You can find him as the Flight Attendant on their trip to Florida, a stock boy who is visible when Roseanne teaches them to bowl with the frozen turkey in the grocery store, as a caterer on a Thanksgiving episode, etc. Any clues?

His name is Diamond Reed and he played 13 different people between the 8th Season and The 9th Season, he had a strong friendship with Roseanne after spending sometime as her personal assisant, he is also an improv actor and writer