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: 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.