Trivia: The Sator Square dates back to Pompeii and is a square of 5 Latin words making a palindrome: Sator, Arepo, Tenet, Opera, and Rotas. Whichever orientation the square is in the words line up in both directions. Each word features in the film - Kenneth Branagh's character is named Sator, the forger mentioned near the start is Arepo, the title is of course Tenet, the opening sequence takes place in an Opera, and the Ukranian special forces who arrive in that sequence have badges on their arms with "Rotas" on them.
Trivia: Director Jason Reitman is the son of Ivan Reitman, director of the original "Ghostbusters" and "Ghostbusters II." As a child, Jason actually had a cameo in "Ghostbusters II" during the birthday party in the beginning. (He's the kid who tells Ray he heard the Ghostbusters were "full of crap").
Trivia: Panning around Diana's apartment, the camera briefly lingers on a photo of her with an elderly lady, with no elaboration of its significance. But look closely and you'll realise the woman in the photo is Etta from the first movie, again played by Lucy Davis, just made up to look 67 years older.
Trivia: When Barley and Ian are paying their toll at the "troll bridge", look on the right hand side and you can see the Pizza Planet Truck.
Trivia: This is the third film in the X-Men franchise to make reference to the villain Mr. Sinister, following X-Men: Apocalypse and Deadpool 2, by way of the Essex Corporation (Nathaniel Essex being Mr. Sinister's real name). The logo for the Essex Corporation is a diamond, similar to the ones Mr. Sinister has on his forehead and chest in the comics. Unfortunately, since this is the final film in the Fox X-Men franchise, Mr. Sinister himself never made a physical appearance in any of the films.
Trivia: Dylan's mom's story about the Florida man who was in bed when a sinkhole opened up under him actually happened to Jeffrey Bush on 2/28/13 in Seffner, Fl (Tampa suburb). He (along with his bedroom furniture) was entombed. Brother Jeremy heard him scream, jumped in with a shovel and tried to dig him out, but Jeffrey's body was never recovered. The house was razed and the sinkhole filled in but it re-opened 2+ years later on 8/20/15. Sinkholes are common in FL and 6 states - AL, KY, MS, PA, TN, TX. (01:26:35)
Trivia: Chloe Zhao won the Academy Award for Best Director for this movie. Zhao became the first Asian woman and the first woman of colour to win the Award.