Factual error: Aquaman lifts a submerged submarine towards the surface, which should start to sink again straight after releasing it, as its ballast tanks are still full of water. It shouldn't stay floating like that.
Aquaman (2018)
Directed by: James Wan
Starring: Nicole Kidman, Dolph Lundgren, Amber Heard, Jason Momoa
Continuity mistake: When Black Manta gets the gold coins from the Atlantians the bag falls in front of him but in the next shot the bag is behind his feet.
Continuity mistake: While Arthur as 16 year old trains with Vulko he falls into the water and gets his back wet, but in the next shot the shirt is dry.
Trivia: The Anabelle doll from The Conjuring, another film of director James Wan, is visible while Mera is taking Arthur to her submarine ship. Blurry but there.
Arthur Curry: My parents were of two different worlds, and I was a product of the love that they shared. A son of land, and a son of the seas.
Orm: You were the reason our mother was executed. And I've hated you for it ever since. But I do not want to kill you, Arthur. I am going to give you one chance. Go home. Do not ever come back to Atlantis. You are not going to win this. A war is coming to the surface whether you like or not. And I am bringing the wrath of the Seven Seas with me.
Arthur Curry: You know I can't let that happen.
Orm: I know.
Jarhead: You the Fish Boy from the TV?
Arthur Curry: It's Fish Man.
Question: There is something I don't understand about Arthur. Why is he so reluctant to be king of the undersea nation of Atlantis?
Answer: I agree with the other answer but would add that suddenly becoming the ruler of such a huge and diverse kingdom that he'd been detached from growing up and to then assume such an immense responsibility would be daunting. Being king means sacrificing your personal freedom in the service of others.
Answer: Because he felt abandoned, by both his mother and his people. He was considered the bastard of a human and mermaid, and, like an interracial couple, it was considered illegal and immoral. Why rule when you're not wanted?
Question: How did others find the trident's location? We know Arthur is the first person to see the clue to the trident's location, so why are there dozens of skeletons of past victims, how did so many others magically stumble across the trident?
Answer: You said it yourself some might have stumbled upon it, others could have used the map, which is why it was hidden in the first place.
How could they use the map when Arthur was the first to find it...quite frankly to stumble on it is impossible, you would have to randomly travel to the trench, go through the entire kingdom, see a tornado of death and decide to go in, get spat out and not eaten, get to shore, check behind a waterfall and follow it down...bit much?
Answer: Just because he's the bad guy doesn't mean he didn't go to college. He could be a genius and gotten a brief working knowledge from the Atlantis soldiers.