Despite being canonically tied to the HBO Max's "Harley Quinn" the role of Lex Luthor was recast to the now late Lance Reddick. He having taken over the role from Giancarlo Esposito (who voiced the character in the aforementioned "Harley Quinn") for reasons unknown.
Dean Lorey left his showrunning position for Harley Quinn (2019-presnt) in favor of working on this spin-off.
Noonan's Bar actually exists in DC Comics.
Originally titled Noonan's.