Justin Hartley, who plays the voice of Superman, previously played the live-action role of Green Arrow on the TV series Smallville (2001). "Smallville" is a series about Clark Kent before becoming Superman. This would also be Justin's third DC outing as he also had the starring role in the unaired Aquaman TV Pilot.
Edwin Hodge who voices Killer Croc & Mr. Terrific is the older brother of Aldis Hodge who will play the live-action version of Hawkman, another member of the Justice League, in "Black Adam".
WILHELM SCREAM: Can be heard faintly from the pilot who is thrown from his jet plane by Wonder Woman.
The final position in the Superman - Mister Terrific Chess game is the same position as in the famous game between Donald Byrne - Bobby Fischer, New York Rosenwald tournament of 1956. It was dubbed, The Game of the Century by Hans Kmoch.
This will be the third time Gillian Jacobs does voice work for a DC project. The previous ones are Roxy Rocket in Justice League Action (2016) and Mera in Aquaman: King of Atlantis (2021).