Michael Ironside also voiced Darkseid on 'Superman: The Animated Series' and 'Justice League Unlimited'.
Darkseid is holding a struggling non-speaking Forager, another Jack Kirby Fourth World character.
Oberon, Mister Miracle's manager, has a brief non-speaking cameo when he runs up on stage and Harley hits him with her bat.
In the comics Harley battles Granny Goodness & briefly becomes "Hammer Harley" a fury. She frees the Olympian gods Granny captured.
Jim Gordon has a "Never Forget" tattoo with an image of Clayface's baby hand from You're a Damn Good Cop, Jim Gordon (2020).