Footage of when Volcana blasted Superman with a fire ball in the parking lot is reused during Superman's nightmare; when Lois Lane shoots Superman's ankle-cuffs; the various times when the military opens fire at Superman, Lois, and Supergirl; and finally three more times during the final showdown.
Superman's uniform was changed to black and grey by Darkseid's Omega Beams. This is the same look of the actual Superman costume George Reeves wore on the 1950s show while filming the black and white episodes.
Gen. Hardcastle asks Superman, "How would you win back our trust? Rescue a kitten from a tree?" which is a reference to the scene where Superman returns a girl's cat that was stuck in a tree.