First appearance of Guy Gardner, Plastic Man, Blue Devil, Icon, and Rocket, as associates, if not actually members, of the Earth-16 Justice League.
Appearances of Arc #16; the show opens with a time-stamp of 8:08. (8+8=16) and the fight on the bridge in Star City happens at 16:57.
The Joker is played by Brent Spiner, best known for playing Data on Star Trek: The Next Generation (1987). His predecessor, Mark Hamill, is best known for playing Luke Skywalker in the Star Wars films.
The events depicted occur on October 1st and 2nd.
Beginning of the running gag "It's COUNT Vertigo to you, peasant"