During the fight scene between Jaime and Carapax on the island, Khaji-Da tells Jaime that it can create any weapon he can imagine. He then proceeds to create the iconic Buster Sword from the Final Fantasy VII video game series.
In the opening titles, a green light is spotted while the Scarab hurls through space. Director Angel Manuel Soto confirmed that this was a reference to the Green Lantern Corps, who in the DC Comics were the enemies of the Scarab and its creators the Reach.
DC Studios chairman and CEO James Gunn (who was hired after the film's production) stated that while the film is set in the DC Extended Universe, it is ultimately "disconnected" from the universe. Furthermore, he intended to incorporate Blue Beetle into his upcoming rebooted DC Universe, with Xolo Maridueña reprising his role.
The film was originally set to be exclusive for Max (formerly HBO Max), but it was granted a theatrical release.
"Bruce Wayne bought Twitter" is spoken in Spanish on a TV in Jaime's house.