Bruce tells Barry that NASA uses a "silica-based quartz sand fabric" on the space shuttle "to prevent it from burning up on re-entry". LI-900, placed on the shuttle's "belly", is made of 99.9% pure silica glass fibers.
Aquaman tells The Flash: "You say a word about this, you'll meet every piranha I know." Neat trick: Piranhas are indigenous to the Amazon basin (Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, Suriname, and Venezuela), and do not live in the ocean.
It is claimed by Cyborg that the mother box came to life after Superman was killed in the events of Batman vs Superman, however in the video that Wonder Woman watches during BvS it can be seen as reacting and creating Cyborg.
The area code of the bank which has foreclosed on the Kent farm is "785". "785" is the area code of the north-half of Kansas, which jibes with the tag on Jonathan Kent's truck in Superman IV: The Quest for Peace. However, in Smallville: Lineage, Smallville's zip code (67524) places the Kent farm in the "620" area code.
When the Flash/Barry Allen is going undercover into S.T.A.R. Labs as an Air Force MP, and Cyborg/Victor Stone hacks the computer to give him clearance, he puts his date of birth as 11/06/10. This would make him 7 years old. He wouldn't quite meet the age requirement for the military if that were the case.
In the Tunnel fight scene, before Flash starts saving civilians, Flash states how he is afraid. This should have attracted the parademons since they can smell fear, but given multiple civilians much closer to parademons and much more afraid than him, it's perfectly reasonable to assume that their fear was overwhelmingly stronger and completely masked Flash's fear.
At the end of Batman v Superman: Dawn of Justice we see dirt rising up from Clark's casket, indicating his return from the dead. In this movie that scene seems to be ignored, since Clark is clearly dead when they dig him up. Evidently, the dirt is not rising because Clark is coming back to life on his own. It could be some residual effect of his powers (kind of like a human corpse twitching) or something else entirely. In any case, this scene was clearly intended to be a teaser for the sequel and nothing more.
When Batman is driving the bat-tank and One of the flying aliens rips the cannon off of the bat-tank and starts to smash the bat-tank with it, however later when Aquaman is standing on the bat-tank the cannon is still attached. Actually the creature tore off one the smaller machine gun barrels to destroy the other one. The bigger cannon that Aquaman is standing next to fires much heavier ammunition and was never destroyed.
Near the beginning, when Wonder Woman uses the "Lasso of Hestia" to compel a man to tell the truth about who he and his compatriots are, he replies "we're a small group of reactionary terrorists". Terrorists usually think of themselves as freedom fighters, patriots, warriors of God etc., not terrorists. However, not every terrorist is a true believer, becoming a member of a terrorist group for other reasons (greed, revenge, confusion, coercion, etc.), and even true believers can feel the error of their ways deep down, not even admitting that to themselves until the Lasso compels them to.
When the Flash goes undercover to sneak into S.T.A.R. labs, he is wearing an Air Force uniform with one stripe on his sleeve. He then hands his military I.D. card to the guard who then scans it. After scanning, the computer screen displays information indicating his pay grade is E7. An E7 in the Air Force would have six stripes on his sleeve, not one stripe. However Victor who is hacking the system to grant Barry access is still figuring out his powers and as the team are on a time limit it's so he just picked a random rank that would allow Barry to enter a top secret base.
The Parademons are shown to have super strength (as, for example, they ripped off parts of the Batmobile and they easily caused it severe damage), but they were attacking the Russian family's house (which has a very poor structure) for a long period of time and they couldn't even storm in.
Bruce says to Diana: "You shut yourself down for a century", meaning from 1917-2017. Diana tells Bruce in Batman v Superman: Dawn of Justice that she "walked away" from Mankind a 100 years ago, meaning from 1916-2016. Wonder Woman is set in 1918. Oddly, Bruce mentions Steve Trevor, who is introduced in "Wonder Woman".
After The Flash pushes the family's truck to safety, the father, in the driver's seat, faces The Flash at an unnatural 180° angle. Not only that, his face looks as though it has been flattened against the truck's rear window.
When Bruce Wayne meets Aquaman for the first time in the fishing village, you can clearly see in the first shots that Aquaman has greenish eyes with small pupils. However, when later in that scene Aquaman takes of his sweater and walks into the water (and up until he dives backward into the sea) he suddenly has blue eye with normal pupils (i.e. we see the actor's real eyes).
The team arrives at the Kryptonian ship at night. It takes them minutes to revive Superman, yet when the force from being revived hurls Superman through the roof, revealing the sky, it is dawn outside.
Cyborg says the Mother Box needs to be "jump-started" in order to produce enough energy to revive Clark. Yet the Mother Box is self-sustaining, as evidenced by the fact that it "jump-started" itself in Dr. Stone's lab in Batman v Superman: Dawn of Justice.
After Superman's resurrection, the Mother Box is thrown out from the Kryptonian ship and it lands on a car. A few moments later, a Boom Tube appears on the Kryptonian ship and Wonder Woman says "Steppewolf has the Mother Box". But the Mother Box was never on the Kryptonian ship.
As Victor and Barry exhume Clark in the dead of night, we must assume that Bruce either did not ask for or obtain Martha Kent's permission to exhume Clark, in which case, he, Victor, and Barry should have been arrested.