Goof: How was Green Lantern able to help lift Superman's key? The key was yellow a weakness of Green Lantern's power ring and his ring would not work even to augment his strength.
El Dorado, Robin and Aquaman also appear in this episode but have no lines of dialogue.
Goof: At the end of the flashback when Firestorm is devastated over Superman's supposed death, the faraway shot shows the legs portion of the latter's costume colored green.
Goof: When Darkseid directs his omega beams on Superman, they bounce off the walls and ceiling before they strike him. In the next scene as Superman resists, the beams are aimed straight at him.
Goof: In Superman's Fortress of Solitude, the area designated for research into Kryptonite is indicated clearly, with Kryptonite incorrectly written as "Kryponite."
Firestorm: How'd you like to go down in history as the guy who failed Superman?
Batman: (just before jettisoning Superman's body into the sun) Farewell, good friend. You'll be missed beyond words!
The city scene where people are fleeing in terror when Darkseid's cruiser approaches is stock footage from an early scene in The Seeds of Doom when Lex Luthor terrorized it with his robot spider.
The next time that Superman apparently died in an animated show was in the Justice League episode " Hereafter."
This is the only appearance of both the Flash and El Dorado in this series.
JLA Roll Call: Superman, Batman, Robin, Wonder Woman, Green Lantern, Firestorm, Cyborg, Aquaman, Flash, Hawkman, Samurai, and El Dorado.