Since Brainiac is a sentient computer, why would he have to depend on a wrist-mounted keypad to control the various functions of his ship while he resides in one of his robot bodies? He should be able to control everything mentally.
In the most recent Brainiac episode, the JL/Static Shock crossover "A League of Their Own," the League has the last remnant of Brainiac stored in their station (from an unspecified previous adventure). When Brainiac is finally defeated there, he is apparently re-destroyed yet again. Even if some small part of him survived, it seems unlikely that it would be able to travel halfway across the universe, create a giant Brainiac-shaped space station, an army of Brainiac droids, make a deal with Darkseid, and send an invasion ship to Apokolips. (editor's note: we don't know if the sequence of events in the JL universe follow air order - the Static episode may have been intended to air after Twilight (much as "Fury" and "Injustice For All" ... got switched). Also, since Brainiac can transfer his consciousness and make copies of himself, it's possible the "Brainiac" in Static was a duplicate.)
On the floating island, Wonder Woman is carrying Batman while chasing one of the gods. The problem is when Batman says to Wonder Woman "stay on him!". Batman then jumps from what appears to be around fifty feet and lands unharmed. One possible excuse for this could be that his cape slowed his descent but he appeared to fall pretty quickly.
In the closed captioning, Apokolips is misspelled "Apocalypse" and Darkseid is misspelled "Darksied" repeatedly.
Wonder Woman: Hey, come back here!
Lightray: Only if you catch me!
Wonder Woman: He's worse than the Flash!
Orion: (to Darkseid) Your invasion force is shattered. It's over. Please accept this parting gift with Highfather's compliments. (Boom Tubes ship wreckage to Apokolips)
Darkseid: You imbeciles are letting Brainiac get away! What are you waiting for? Finish him!
Superman: Sure, but only because you asked so nicely.
Darkseid: Idiot. You're wasting your time.
Superman: I suppose you have a better idea.
Darkseid: You should know by now, I always have a plan.
Wonder Woman: Let me get this straight. Orion is Darkseid's own son?
Batman: New Genesis and Apokolips have been at war for centuries. Apparently Darkseid and Highfather exchanged sons as part of some kind of a peace treaty. (Wonder Woman stares) Sounds wacky to me, too.
Superman: You don't know Darkseid like I do.
Batman: We know he used you, humiliated you, brainwashed you, wound you up like a tin soldier and turned you loose against Earth. Cry me a river.
J'onn: I was just thinking. You, me, Wonder Woman, Superman. We are all of us orphans and exiles.
Hawkgirl: Maybe we should call ourselves the "Just Us League."
Kalibak: Father! Father, did you see?!?
Darkseid: Be still, fool. I'm not blind.
Batman: (after looking at floating castle) I'm gonna need a longer grapple.
Tara Strong is credited as Sera, but doesn't appear in this episode.
Character bios: Brainiac, Darkseid, The New Gods, Orion, Kalibak
For the new season the animators give Superman a visual style closer to the taller, thinner appearance he had in his own animated series, rather than the shorter stockier approach he had in the first season of Justice League. They also cleaned up the lines around his eyes and cheeks, restoring him to his Superman: The Animated Series appearance.
In a nice bit of continuity, this episode explains why in the Batman Beyond episode, "The Call (2)," Bruce/Batman doesn't trust the boom tubes. Apparently, the boom tube's portal capabilites make him sick to his stomach.
Ron Perlman takes over the role of Orion, replacing Steve Sandor who did the role in the Superman: The Animated Series series episode "Apokolips...Now!."
When Cartoon Network originally aired this as a special one-off in July '03, they aired the episodes back to back without the end credits of Part 1 or the beginning credits/recap of Part 2.
Rene Auberjonois reprises his role as DeSaad in the later episodes of the SuperFriends series. Robert Morse played DeSaad in his one and only WB animated appearance in the Superman: The Animated Series episode "Father's Day."
Green Lantern and The Flash do not appear in this episode
Hawkgirl's origin (revealed here for the first time, and identifying Thanagar as her planet of origin) actually bears a resemblence to what J'onn J'onzz's origin was in the comic books - being accidentally teleported to Earth by a matter transference device.
Michael Dorn and Michael Ironside reprise their roles as Kalibak and Darkseid from the Superman: The Animated Series. Corey Burton reprises his role as Brainiac from the Superman: The Animated Series and Static Shock series.
This episode's title is also listed in some digital cable guides as "Twilight of the Gods."