This episode establishes that Jessica has written 23 novels over the past 12 years.
Jessica mentions a ten-year-old grand-niece. While two of her grand-nieces have appeared in previous episodes, the youngest of them, Cindy Donovan (who appeared in We're Off to Kill the Wizard (1984)), would be in her late teens by now, so this would have to be a third, as yet unseen, niece.
Jessica's Manhattan phone number is shown to be 212-124-7199.