Nicole Kidman was James Wan's top choice for the role of Atlanna. They were previously set to work together on a remake of At the End of the Spectra (2006), but the film was scrapped. Kidman has been a long time supporter of Wan's career, and has publicly raved about his films Insidious and The Conjuring, calling him "The New Master of Horror". She was also eager to join as filming will take place in her homeland of Australia.

Nicole Kidman, who plays Aquaman's mother Queen Atlanna, had declined the role of Queen Hippolyta in Wonder Woman (2017) (in the comics, Diana Prince/Wonder Woman was Aquaman's ally and sometimes love interest).

The film is based on Geoff Johns's 2011 "Aquaman" comic.

This film marks the fifth collaboration between director James Wan and actor Patrick Wilson, after Insidious (2010), The Conjuring (2013), Insidious: Chapter 2 (2013) and The Conjuring 2 (2016).

Aquaman's suit was supposed to be a surprise in 2016. Instead, Zack Snyder released the photo of Momoa wearing the Aquaman suit in February 2015. Snyder called Momoa moments before its release to the world.

Nicole Kidman immediately accepted the role of Atlanna when James Wan said that she could wear "Mother-of-Pearl and be a Mermaid Warrior".

This is James Wan's third non-horror film and his first superhero film.

Jason Momoa publicly expressed interest in wanting Zack Snyder to direct.

Leonardo DiCaprio was going to produce the film from his production company.

Michael Kenneth Williams and Michael Jai White expressed interest in playing Black Manta.

At one point, the Dead King, an ancestor of Aquaman who was resurrected as an insane zombie, was to appear in the film as an antagonist, but he was removed.

The film's working title is "Ahab", the name of an anti-heroic sea captain in Herman Melville's classic story "Moby Dick".

Michael Beach who portrays Black Manta's father Jesse Kane in the film, had previously voiced Devil Ray (another name for Black Manta) in Justice League Unlimited (2004).

Jeff Nichols and Noam Murro were considered to direct the film.

This is Don Burgess' first time shooting a superhero movie since Spider-Man (2002).

Jason Momoa, who plays Aquaman the King of Atlantis, had starred in the TV show Stargate: Atlantis (2004).

James Wan revealed he had a choice of what film he wanted to direct between The Flash and Aquaman, but chose Aquaman because he is the underdog.

This is Patrick Wilson's second portrayal as a comic book character first being Night Owl in Watchmen (2009)

This is the 3rd comic book adaptation for Temuera Morrison (after Green Lantern (2011) and Barb Wire), 2nd Comic Book adaption for Nicole Kidman (after Batman Forever (1995)), Willem Dafoe (after the Sam Raimi Spider-Man films) and Dolph Lundgren (after The Punisher (1989)).

One rumor was saying that Mera was going to be non-Caucasian to match up with Jason Momoa's mixed race status who is Native Hawaiian/German, Irish and Native American, but it was put to rest when Amber Heard was cast.

Filming wrapped for Cast and Crew on the 20th of October 2017.

Ocean Master's real name Orm means "snake" in Swedish.

Jason Momoa added more blonde highlights to his hair to be closer to the original incarnations of Arthur Curry/Aquaman, who is entirely blonde in the comics.

King Nereus and Mera appear as father and daughter in the film, while they were unrelated and betrothed to marry in the New 52 comics.

This is Graham McTavish's sixth comic-book role, after Loki (Marvel animated features), Sebastian Shaw (Wolverine and the X-Men (2008)), Savanti Romero (Teenage Mutant Ninja Turtles (2012)), Fergus McDuck (DuckTales (2017)), and the Saint of Killers (Preacher)

James Wan believes that what makes Aquaman unique is his Atlantean heritage: "We're used to superhero movies where the threat is from another dimension or aliens from another universe coming here and trying to destroy our Earth. But we haven't seen one where the main threat is from a massive, massive civilization that is right under our nose, in the ocean.... The idea that there could be a massive civilization living right underneath [us] that we don't know about is kind of scary and exciting."

Nicole Kidman second comic-based film. She previously played Bruce Wayne's love interest in Batman Forever (1995).

Kurt Johnstad and David Leslie Johnson worked on the script before being replaced by Will Beal.

Many rumors were reporting that Karl Urban was cast as Ocean Master.

Patrick Wilson and Michael Beach have worked together in Insidious: Chapter 2 (2013) which James Wan directed.

This is the first DCEU film to be shot entirely with digital cameras, all previous installments were shot on 35mm film (and partially 70mm IMAX film for Batman v Superman: Dawn of Justice (2016))

According to Amber Heard, the underwater filming required cast members to be hosed down, and then shooting took place on a cold soundstage.