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: The script was kept as secret as possible, even from the stars. Robert Pattinson was only allowed to read it once before filming, in a locked room. Michael Caine was only given his specific scene to read, and has said that he had no idea what the film's plot was, despite his close links to Christopher Nolan.
Trivia: When the Protagonist and Neil exit the shipping container and begin running past the wreckage of the plane to get to the turnstile inside the Freeport, the ambulance that they steal later in the scene after going through the turnstile can be seen among the emergency vehicles that they run past. It is definitely the same ambulance shown on both occasions as it has the number "02-06" on top and has the same number plate "ZXI04712." The Protagonist, wearing the same armor, can also be seen sitting in the driver seat. It is not something that the camera focuses on, but it can be noticed in the background of shot. (01:40:52)Casual Person