Trivia: As Parzival is approaching Aech at the race and asks how she got there before him, there is a blue ninja walking behind Aech's monster truck. This is Sub Zero from Mortal Kombat in his latest design from Mortal Kombat X. (00:11:25)
Trivia: Stan Lee makes his usual cameo as the guy that accidentally gets his car shrunk by Hope during the climactic chase. Sadly, this was the last Stan Lee cameo released before his death in November, 2018. (Although he had already filmed cameos for several other upcoming films before his death).
Trivia: In Dryden Vos' meeting room, the golden idol from the opening scene of "Raiders of the Lost Ark" can be seen briefly on one of the tables. So too is Mandalorian body armour, similar to Boba Fett's.
Trivia: When Rory is walking down the street wearing the Predator mask, there is a bright red/orange alien walking toward him. This is a nod to the original Predator costume that looked like a big bug, the red/orange color was used to film the stealth camouflage scenes. The bug suit was scrapped after a few test shots proved how silly it looked. Jean-Claude Van Damme was in the original costume, but he was let go when the costume was scrapped. (00:45:20)
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.
Trivia: Spoilers: There's a pretty subtle bit of foreshadowing in Gary's house. When he's seated and the group is playing Jenga, if you look behind Gary, there are two old-fashioned guns on the mantle. The way the shots of Gary are framed throughout the scene, both guns are pointed right at him several times. Later in the movie, Gary ends up being shot twice by two different guns - once by a gun loaded with blanks and once by a gun loaded with live ammunition.
Trivia: The $100 bill in the closing credits has the serial number DOT00002018. Which stands for Den of Thieves 2018, the year it was released. (02:24:00)