The film is actually very inspired by Lovecraftian works (as is, apparently, James Wan in general).
The most "obvious" one is perhaps the creatures of the Trench (much more than the monster guarding Atlan's trident, IMHO).
A Slate article from December 2018 highlights the Lovecraftian influences on the movie:
Despite the chaos, director James Wan lets ...
It's class/genetically based.
Here's an excerpt from an article i found.
While it involves genetics, it also seems to be a matter of class standing. Through the film's dialogue, it's explained only highborn Atlanteans are able to breathe both air and water. That means royalty and anyone who associates with them on a regular basis.- Aquaman Movie Explains ...
"But no. Aquaman was visually very beautiful and a fine film but there was no Lovecraftian horror I could discern."
Well everyone has their opinion, but CBR, strongly disagrees with you.
Early in the film, during the prologue showing the relationship
between Arthur Curry's parents (Thomas and the Atlantean queen
Atlanna), a copy of the book The ...
Copy-pasting my answer to What are the Seven Kingdoms in Aquaman? on SFF:
Atlantis. No need to explain that one, I think.
Xebel, ruled by King Nereus. IIRC Xebel isn't shown in the movie.
The Trench, inhabited by monsters.
The Fishermen Kingdom, land waters of the mermaid-looking people.
The Brine, with its crab-like people, and where the final battle ...
At that time Arthur was wounded by Black Manta and lost consciousness.
Even Mera was exhausted due to the fight, She cannot carry Arthur and swim. Hence they used boat.
Mera : Arthur! Stay with me. Wake up.
Arthur : You steal the ship. Boats in the harbor is not public.
It was stated in film itself that Orn made Black Manta steal a submarine and then use that to stage a fake attack from humans. It was the same submarine incident where Black Manta lost his father due to Aquaman not helping him.
This discussion happen later when Orn sent gold coins to Black Manta.
There is no in universe explanation how Aquaman got his tattoos. It was director Zack Snyder's idea of getting the character tattooed.
Regarding Aquaman's skin being bullet proof, he is not completely bulletproof. He has a denser muscle under his skin.
Director James Wan replied to this same question asked on Twitter.
Oh, bullets (or whatever else) ...
In most works of fiction, Atlanteans are weakened while out of water. This includes DC Comics' Atlanteans. As said in the comics' description of Mera on the DC Comics wiki :
Prolonged exposure in an above-water environment will cause Mera to weaken, and ultimately die.
On the linked page, this weakness is linked to Mera's peculiar metabolism, which is ...
It wasn't in Atlantis proper.
As far as I understood, this was a place where people from the different kingdoms could meet up.
After Atlantis had sank into the ocean it was split into seven kingdoms, the kings of these respective kingdoms agreed to meet here.- Council of Kings - DC Comics Extended Universe Wiki
This quote shows that it was abandoned:
According to Producer Charles Roven at Warner Brothers, Aquaman takes place after Justice League.
James [Wan] definitely knows where he’s going with [Aquaman], and that
movie takes place in a world where Justice League happened, and Man of
Steel happened, and Wonder Woman obviously takes place before Man of
Steel — except for the bookends we have. ...
While it is true that their gear (scuba/re-breather suits) would have helped them breathe for a while, it was not a viable long term solution. Eventually they would have run out of oxygen. Even before that happened, they would reach such depths under which the suits would no longer function and they would be crushed by the pressure of the water. Typically ...
While there is quite a bit we do not know about the fictional fantasy world of Atlantis, we have been told that Atlantis split into 7 kingdoms. Four specifically mentioned in the movie, three to remain largely a mystery, or at least a puzzle, but truly six kingdoms are represented in the movie.. Fandom's website has listed all seven, but their pages are ...
From where did it come from ? Most likely, that armor was a gift from Vulko once Arthur became an adult. Although Vulko stopped visiting Arthur and teaching him combat, we do not know the exact timeline, and as such can wager that they were still meeting from time to time. Since no sane blacksmith would forge such an outlandish armor these days, we can ...
Did the Sea-Monster serve king Atlan?
What suggests it doesn't?
Karathen was protecting the trident for Atlan and even Atlan was the last one who she can talk to, so of course she was doing Atlan's bidding by protecting the Trident's misuse. But as padfoot mentioned it looks more like allies rather then servitude