Numerous underwater waterfalls are seen in this movie. This is an actual phenomenon. The ocean is made up of two different layers of water: warm, light water, and cold, dense water. The difference in densities means the layers are separate and causes the heavier cold water to fall, forming a waterfall.During the duel between Arthur (Jason Momoa) and Orm (Patrick Wilson), an octopus plays a drum solo. According to writer and director James Wan, this octopus is Topo, Aquama's octopus sidekick from the 1950s and 1960s, who was able to play musical instruments.

Andrina Curry: The daughter of Aquaman and Mera. ...
Aquababy: Son of Aquaman and Mera, Arthur Curry, Jr. he inherited Meras water-controlling powers while having the unique ability to create and mutate sea life. ...
Aquagirl: See Aquagirl.

Aqualad: The son of Black Manta who chose to become a hero.

Arthur Joseph Curry: Orins successor as Aquaman.