Other mistake: Barry comes back to his home, replaces the fuse in the fuse box, flips the handle (begs the question of why remove the fuse AND turn off the switch, but whatever), and within 2 seconds every screen in the place is lit up. Sure, a TV might come on that fast, but plenty of those screens are showing data, analysis, etc, running off computers, which would take longer than that to boot up and get everything running.

Zack Snyder's Justice League (2021)
1 review
Directed by: Zack Snyder
Starring: Ben Affleck, Amy Adams, Jared Leto, Henry Cavill, Gal Gadot, Ezra Miller, Ray Fisher
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Average rating
(6 votes)
This is a vast improvement over the theatrical version. It was nice to see characters like Cyborg and Flash get more lines and development, and much of the cringey humor and awful CGI are now gone.
However, the movie still suffers from trying to set up future storylines that in all likelihood will never come to fruition. Deathstroke's vendetta against Batman is given no context, and it is only made even more murky by the scene with the Joker.
Maybe these scenes make sense to hardcore DC fans, but to a casual viewer like myself, they are a little confusing.
There's also no good reason for this film to be 4 hours long. I'm not opposed to movies with long runtimes if the story justifies it, but in the case of this version of the film, the runtime is padded by excessive amounts of slow motion shots (which Zack Snyder uses as a crutch) and unnecessary moments, such as the scene where a few village women sing a song in tribute to Aquaman while one of them sniffs his sweater.
Jonathan Kent: You were sent here for a reason. And even if it takes you the rest of your life, find out what that reason is.
Trivia: Director Zack Snyder has a cameo at the coffee shop while Lois is outside of it.
Question: When did Martian Manhunter get to Earth, why did he assume Martha Kent's identity, and where is she during Justice League?
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Answer: Martian Manhunter is played by Harry Lennix, who also plays General Swanwick, a character who appears in Man of Steel and Batman v Superman (and we can see he transforms back into Swanwick he leaves), revealing that Swanwick was Martian Manhunter the whole time, so the indication is he got to Earth before Man of Steel. He assumed Martha's identity to speak with Lois, specifically to have a heart to heart with her as she is depressed due to Clark's death. Martha is present every other time we see her, when she leaves the Kent home at the beginning and when she reunites with Clark later on. This scene was the only time Martian Manhunter used her identity.
Casual Person