Viewers of the Zack Snyder cut of Justice League will likely see this version as a more "complete" experience of the DC Universe film. Moreover, this finally shows fans a more concrete adaptation of the DC Comics super-team. However, it seems that the Snyder Cut has more to show than just an extra hour's worth of footage. In fact, eagle-eyed DC Comics fans might notice some extra details that flesh out some intricacies within the film.
Given the four-hour watch time of the Snyder Cut, it makes sense for the ordinary viewer to miss some details. However, for the hopeful fan, some mysterious details could help add insights to upcoming DCEU films - and what a JL sequel might be about.
10 Room For A Green Lantern
Sadly, there aren't any Green Lanterns in the present-day Snyderverse. While Diana was explaining Earth's first defense against Darkseid, the flashback clip shows Yalan Gur. In the comics, he's one of the "greatest" Green Lanterns ever. Moreover, Cyborg's visions of Knightmare also revealed the body of the Green Lantern Kilowog, dead amongst other heroes at the hands of a Darkseid-influenced Superman.
Interestingly, signs do point towards their continued existence. As Diana's flashback revealed, Darkseid attempted to hold onto the Green Lantern Ring after he's killed Yalan Gur. Thankfully, Zeus's attack gave the Ring time to float away. In turn, this implies that the Ring would find a new wielder to protect Sector 2814, the Green Lantern local code for Earth and its cluster of nearby worlds.
9 A Superman In Mid-Life Crisis
In the comics, Superman first dons his black costume in the "Reign of the Superman!" storyline in 1993. In here, the suit adds more protection to the Man of Steel - as this time around, he has weakened powers and cannot even fly.
Interestingly, Snyder Cut Superman donned black more as a philosophical and personal choice. One might surmise that the reborn Clark chose to wore the black suit as a homage to fellow Kryptonians, who also wore black warsuits. According to Zack Snyder, Superman's black outfit signifies a mid-life crisis of sorts for the Man of Steel. In fact, future films would've been able to highlight Clark's "transition" back to the red-and-blue.
8 Barry May Have Broken The Rule Twice
According to the Snyder Cut, Cyborg originally fails to stop the Mother Boxes from their Unity, and its resulting shockwave implies the destruction of everything around it. It's at this moment that Barry decides to "break the rule." This allows Barry to exceed lightspeed, reverse time, stop the calamity, and successfully empower Cyborg into dismantling the Mother Boxes with Superman.
However, fans might notice that Barry may have broken the rule twice. The first instance of this happening may have occurred in Superman's resurrection. As fans remember, the Flash turned out a few milliseconds too late as the Mother Box already plunged into the ship's Genesis Chamber before his energies empowered the Mother Box. Thankfully, the Flash somehow manages to reverse time a bit, raise the Mother Box off the water, and gives it a healthy dose of energy pre-plunging to successfully revive Superman.
7 There Might Be At Least Two Bad Endings
Call this a stretch, but it's been a trope in time travel media that while every "choice" creates an alternate universe, the plot only shows both relevant choices and relevant timeline divergences. Connecting this with the two instances of breaking the speed barrier earlier, this trope implies two instances where the team's plans failed. In turn, their respective "the Flash reverses the time" scenes imply the existence of two bad universes - even prior to Knightmare that requires the saving of Lois Lane to prevent from happening.
First, the Flash not getting to the Genesis Chamber in time implies the Mother Box failing to activate or activating at the wrong point in time. As such, this alternate ending gives audiences no Superman, or a deformed Superman (like a Mother Box-empowered Doomsday). Secondly, the Flash not giving Cyborg enough juice to infiltrate the Mother Boxes will have their Unity create a powerful blast. As implied by Flash's time-reversal, the blast would've decimated everyone around it - including the Justice League.
6 Anti-Life Is Proof That Darkseid, The Martians Loved Their Math
It's thanks to the reveal of the Anti-Life Equation that Darkseid would become more invested in the conquest of Earth rather than bearing a grudge against its previous defenders. Like in the comics, the Snyderverse Anti-Life Equation is a power capable of stripping the free will of its target. In the hands of Darkseid, he would be able to control the whole universe.
In the comics, Darkseid's contact with the Martians led him to learn about the Life Equation first. This transcendental mathematical proof bestows free will unto its users and aspires to protect life. In turn, Darkseid theorized that the opposite must be true. As such, Darkseid conducted experiments on humans after discovering that fragments of such an Anti-Life Equation existed in their consciousness.
5 The Martian Manhunter May Have Ties To Anti-Life
In a surprise twist, it's the Martian Manhunter - and not the Green Lantern - that would serve as the seventh member of the Justice League in the Snyder Cut end credits. Despite some fans treating his appearance as a forceful addition, information about the Anti-Life Equation may tie to this change. Granted, Snyder may not have thought of this reasoning - but the reasoning makes sense nevertheless.
Given that Martians discovered the nature of the Life Equation first, it would make sense that the Martian Manhunter would have some idea of its existence. In turn, he along with Cyborg could become the best authorities towards the Anti-Life Equation among the League.
4 The Lantern Corps Still Had A Connection With Anti-Life
While the Martian Manhunter did replace the Green Lantern in the end credits cameo, this doesn't mean there's no room for a Lantern in the Hall of Justice. Given that a Lantern was present to fight Darkseid in his first attempt to invade Earth, it makes sense to assume that the Guardians of Oa knew about the Anti-Life Equation.
Likewise, it's also the Lantern Corps that would discover and ultimately use the Life Equation to combat its counterpart - at least in the comics. As it turns out, the Life Equation is also a successful combination of all the colors within the Emotional Electromagnetic Spectrum. In the comics, it's Green Lantern Hal Jordan, in his time as a White Lantern, who successfully wielded the Life Equation against Anti-Life. Interestingly, a potential Green Lantern film might follow the same route.
3 The Mother Boxes Confirms Element X
The Snyderverse's fabled Mother Boxes demonstrated their terrifying capabilities across the film. Under synchronized Unity, the Mother Boxes could even tear a hole from this universe to Darkseid's and usher his arrival. Thankfully, efforts of the Justice League halted Darkseid's approach and destroyed the Mother Boxes.
However, given their nature in the comics, the Mother Boxes in the Snyderverse may lead to something else: Element X. In the comics, Element X or the Tenth Element, is the "purest" form of creation, altered by sheer thought itself. Additionally, Element X serves as the power source of technologies (e.g. Mother Boxes) that belong to Darkseid and his race of New Gods.
2 The Lex Luthor Agenda
The opening sequence of Snyder Cut showcases some characters hearing and feeling Superman's death rattle at the hands of Doomsday. Among these clips is a scene that alludes to "Communion," a deleted scene in Batman vs Superman. As the clip shows, Lex is seen hearing Superman's death cry while looking at a Steppenwolf hologram who was showing the Mother Boxes.
However, what might be curious is Lex Luthor's overall agenda in the first place. Given the title clip of "Communion," fans can debate whether the Steppenwolf "hologram" simply alludes to Luthor learning about the Mother Boxes or Steppenwolf actually communicating with him. However, if it's the latter, for what purpose does this communication serve?
1 Knightmare May Lead To Dark Multiverse
Thanks to the Future Flash tease in Batman v Superman and the upcoming Flashpoint film, DCEU fans know that the multiverse somehow exists. Moreover, the Knightmare sequence reveals a darker alternate timeline where Bruce's failure to save Lois Lane led to Darkseid's victory. However, recent DC Comics stories may hint at a darker truth.
If the Snyderverse will take some cues from recent comics events, then the Knightmare reality may very well be part of the Dark Multiverse. Within the Dark Knights: Metal event, it's revealed that the Dark Multiverse is comprised of universes born out of every wrong decision and fear known to the living. Interestingly, Element X is capable of overcoming the Dark Multiverse's forces.