Winchell and Hunsecker
Walter Winchell a one time gossip columnist, was the inspiration for the character of J. J. Hunsecker. Winchell had been an actor, but transitioned to a reporter when jobs were scarce, starting a backstage newsletter. Eventually he became a very powerful man in not only show business, but in the country as a whole. He was very self-absorbed, naming a son Walter Jr. and a daughter Walda, often domineering and cruel, but at times very generous as well, maintaining his influence for more than 30 years.
He had many sources like Sidney Falco and a host of ordinary citizens as well that fed him items. When Lucille Ball became pregnant, Winchell wound up printing the news in his column even before Lucy got the word from her doctor. Talking of the incident Lucy said that she thought she was pregnant, but it wasn't until she read Winchell's column that she was absolutely sure.
And there is a funny story about Winchell and this movie. When he saw a preview of the film he was not insulted and missed the connection to himself. Instead he called up fellow columnist Jimmy Fidler and told him he had just seen a new film that had a very unflattering portrayal of a columnist that was obviously meant to be Fidler. He told Fidler that if I were you Jimmy, I'd sue.