Lenny Ross appears to reveal to Frank that he was dying of cancer related to his being one of the First Responders at the World Trade Center on September 11, 2001; on June 12, 2023, exactly a month after this episode aired, Treat Williams was killed in a motorcycle accident.
An Irish exit, also known as an Irish goodbye, is when someone leaves a social gathering without telling the host. It can involve slipping out the front or back door seemingly unnoticed by the host.
Frank and Lenny sits at the bar, in the beginning and talks about a waitress named Kate, that wouldn't date Lenny. He think it because he was a cop, but then finds out she married a cop by the name of Benny. In the series Chicago Fire (2012), Treat Williams, who plays Lenny in Blue Bloods, plays a character named Benny.