Trivia: In "Split", James McAvoy was filming a scene with the multiple personalities talking amongst each other, and he punched a door that broke his knuckle. Atomic Blonde was filmed right after Split, which is why he has a cast on his arm as the director decided to work the real life injury into the film. McAvoy has said "It was fun actually, getting to use a plaster cast to smash people's faces."
Trivia: When Dwayne Johnson signs to George to calm him down, he says "it's me." The sign he makes on those words is for "Rock," a reference to his stage name "The Rock." (00:15:25)
Trivia: When Mr Jimmy gets off the helicopter, he has a quick discussion with Mr. Skip who is played by director Peter Berg. (00:14:00)
Trivia: Stan Lee (Stanley Martin Lieber), the original creator of this comic book hero, has his usual cameo role in this movie. He's the guy who drinks the gamma contaminated soda from the fridge.
Trivia: Stan Lee, who co-created the Hulk, and Lou Ferrigno, who played him in the 70's TV show, have cameos as a pair of security guards in the beginning of the film. Ferrigno later made another cameo as a security guard in the 2008 reboot.
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: According to director David F. Sandberg, when the Wizard and Freddy run away from Hespera, the kid running is a stunt (despite his resemblance to the actor), for "the actor was still a minor and could only work limited hours." Actress Rachel Zegler added that the stunt's name was Shawn. (01:17:36)
Trivia: The Pizza Planet truck, a fixture of nearly every full-length Pixar film, can be spotted in the Witch's Hut.
Trivia: The Cook County collector is played by Steven Spielberg.
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: During the Battle of Vulcan, as Sulu goes under a piece of another starship, you can see R2-D2 go flying past just over his shoulder. (00:47:35)
Trivia: Jimmy Buffet can be seen running back to get his margarita during the winged dinosaur attack on park visitors. (01:18:50)
Trivia: When Crichton talks to "Harvey" (Scorpius in his head) for the first time in the movie, Scorpius is dressed like Einstein. There is a blackboard with equations on it. One of them is "e = MC hammer". (00:21:30)
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: At the festival when the Green Goblin throws his grenades, before the shot of Parker, you see Stan Lee (creator of Spider-Man). He was supposed to pick up the little girl that he pushes to safety, but due to his age, after several takes he said if they wanted him to pick her up, they were going to be there all day. (01:04:10)
