At the restaurant, the maitre'd is almost certainly Arnold Wesker, AKA the Ventriloquist from Batman the Animated Series. The character is drawn exactly the same and though he only has one line, he appears to be voiced by George Dzundza; who played Wesker in Batman the Animated Series as well as Perry White in this and many other episodes of Superman the Animated Series. In universe, this would allude to Wesker trying to go straight by moving to Metropolis and getting a day job far away from his criminal exploits in Gotham.