This episode never aired in the United States, due to NBC pulling it from its schedule and eventually canceling the show, but the show aired in New Zealand in May 2017.
One TV reporter mentions Bialiya, which is a fictional middle-east country. In DC Comics, and some of their animated show offerings, this country is often noted as being harshly ruled by the villain Queen Bee. It borders Khandaq, which is ruled (somewhat) benevolently by Black Adam.
Superman doing the 'turning back time' trick to save Lois' life is the same tactic he employed in the 1978 Superman film.
Van retelling his adventure in Bruce Wayne's library, and tipping over a bust, resulting in his discovery that his cousin is, in fact, the Caped Crusader, is meant to convey that the Wayne Manor in the world of Powerless is the same one seen in the 1967 Batman television series.