Actually when it comes to sitcoms and one-hour dramas, those "producers" are all the staff writers on the show. In television, unlike in feature films, the writer is king, and as he/she gets promoted, they move up the ranks with titles like coordinating producer, supervising producer, executive producer. When you see all these producing credits, just substitute the word "writer" for "producer." Of course there are also vanity credits given to certain stars, but in the case of a performer like Ray Romano, or say, Jerry Seinfeld, his producer credit would be an acknowledgement that he does contribute creatively to the writing of the show and he exercises a fair amount of control over the show's creative direction.