History WesternAnimation / JusticeSocietyWorldWarII

* ArtisticLicenseShips: The inside of the submarine the JSA use to get to the Bermuda Triangle and Atlantis is shown to be very spacious, similar to modern subs. The bridge in particular is large enough for the Captain to have his own command chair. In real life, World War 2 era submarines were extremely small and very cramped, with only enough room for one person at a time to move about. The bridge was the largest part of the sub, but it still would not have been large enough to have any kind of command chair. In addition, there are Active Sonar screens on the submarine. While some subs did have Active Sonar, it was almost never used because it gave away the sub's position. Most submarines instead relied on Passive Sonar to detect ships and objects around them, which did not give away the sub's position.

* CynicismCatalyst: [[spoiler:Losing his adopted parents and bouncing around foster homes, combined with seeing the rampant xenophobia and racism of humans in this time period, has made Shakespeare/Clark cynical about helping others despite having powers because of his status as an alien. Although he eventually snaps out of it after some encouragement from Wonder Woman and Steve, just in time to stop the Nazi Air bombing in the film's climax.]]

* AgeLift: In the comics, Jay Garrick was a young man in the 1940s. This movie has Jay saying things like "when I was younger, I could do that," or "back in my day", implying that his superhero career started earlier than some of his teammates'.

* CynicismCatalyst: [[spoiler:Losing his adopted parents and bouncing around foster homes has made the WWII-era Clark cynical about helping others. He snaps out of it in the climax.]]

** [[spoiler:Both Hawkman and Steve die in the film, though in the former's case since he reincarnates he is not truly dead.]]

** On learning that Steve asks Diana to marry him every day, Flash calls him a stalker. That kind of persistence may have been considered romantic in the '40s, but not so much in the present day. In fairness to Steve however, he is in some sort of relationship with Diana who had once told him that she would one day say yes while always declining in a playful manner, which is very different from him asking someone who has no interest in him.
** Related to this is the fact that Steve is at first confused by the word stalker due to it not being a common phrase in 40s, though he is able to figure out its meaning.

* HistoricalDomainCharacter: In the opening scene, Steve Trevor pitches the concept of the JSA to UsefulNotes/FranklinDelanoRoosevelt, president of the United States.

* ForgotAboutHisPowers: In the comics, Diana's Lasso of Truth has the power to free people from mind control and even from self-delusions. In the Pre-Crisis era the movie is primarily based on, it was even more powerful than that; it could be used to compel people to do ''anything''. And yet she never thinks to use it on [[spoiler:Aquaman]] during their confrontations.

** Aquaman's style of combat with his trident, and using a [[KrakenAndLeviathan Kraken-esque leviathan]] as his ultimate weapon, are clearly inspired from [[Film/{{Aquaman}} his live-action film]].

* OffModel: [[spoiler:After clinging to Hawkman when he dies]], when Canary gets back on her feet and goes to continue the battle, his body is not in the scene anywhere.

* NewPowersAsThePlotDemands: Wonder Woman is fully able to breathe and fight underwater without any apparatus like an Atlantean.

The voice cast includes Creator/MattBomer as Barry Allen, Creator/StanaKatic as ComicBook/WonderWoman, Creator/MatthewMercer as Hourman, Creator/OmidAbtahi as ComicBook/{{Hawkman}}, Armen Taylor as Jay Garrick, Creator/ElysiaRotaru as ComicBook/BlackCanary, Creator/LiamMcIntyre as ComicBook/{{Aquaman}}, Creator/KeithFerguson as ComicBook/DoctorFate, Creator/ChrisDiamantopoulos as ComicBook/SteveTrevor, and Creator/DarinDePaul as Franklin Delano Roosevelt. It comes out digitally on April 27, 2021, and physically on May 11, 2021.