- Creator Backlash: Co-director Christina Sotta mentions that she likes Nightwing, and didn't like his fate here, where he was killed by a Paradoom, revived with the Lazarus Pit and made irreversibly insane.
- Directed by Cast Member: The Latin American dub was directed by Ismael Larumbe, who also voiced Lex Luthor.
- Dueling Dubs: The movie was first released in Brazil with a Miami dub. Combine going for a cheap and oft-underwhelming market note with dropping the cast that had been voicing the DC characters for very long (some as far as the Justice League cartoon, if not earlier) and the outcry was enough for Warner to accept that they needed to redub the movie actually in Brazil with the already estabilished actors.
- Executive Meddling: James Tucker confirmed that the film being the Grand Finale was in fact this in an interview on DC Daily.
- The Other Darrin:
- Role Reprise:
- King Shark is voiced by John DiMaggio, who he first voiced in Batman: Assault on Arkham.
- The Latin American dub features the following cases:
- Armando Guerrero voices Superman, after doing so in the Arrowverse.
- Batman is voiced by Idzi Dutkiewicz, who is his usual voice actor in videogames (most notably the Batman: Arkham Series).
- Miguel Ángel Ghigliazza voices Trigon, as he did in LEGO DC Super-Villains.
- Arturo Mercado Jr. reprises his role as John Stewart from LEGO Batman 3: Beyond Gotham.
- Valentina Souza had already previously voiced Zatanna in DC Super Hero Girls.
- In an odd case, while Sarah Souza had never voiced Wonder Woman before, she had been the voice actor for her Evil Counterpart, Superwoman, in LEGO DC Super-Villains. This had no bearing in taking the Wonder Woman role, however, as the dub director didn't know of this; he just thought she was fitting.
- Torch the Franchise and Run: Due to DC Animation wanting to move away from this universe, the ending makes sure that no future movie revisits this universe as the heroes are decimated, Earth is left near-inhospitable and John Constantine orders Flash to go back in time and prevent the entire tragedy from happening, leading to another Cosmic Retcon that erases this universe from existence.
- Uncredited Role: John DiMaggio isn't credited as Trigon.
- What Could Have Been:
- Mairghread Scott said how Etrigan was not in the original script for the movie. Also, Clark would've had a special lapel that would've summoned Swamp Thing during an emergency.
- James Tucker said that while most of the Justice League would've still been brainwashed, at one point, they suggested that it would happen through little devices planted on them. Christina Sotta then said how that, to show the stakes, it had to be seen as irreversible, and this was dropped.
- Christina Sotta was originally going to name the film Futures End, which she drew some inspiration from, but DC didn't want to confuse fans into thinking it was a strict adaptation of that.
- Screenwriter Ernie Altbacker wanted more time for a Nightwing and Starfire moment but the cast was already huge and there were too many relationships going on in the film.
- Damian and Raven were originally going to kiss in the infirmary, but they decided to save it for the ending.
- Working Title: The movie was originally called Justice League Dark: Last Man Standing .
Trivia / Justice League Dark: Apokolips War