Trivia: Smith tries to explain to the woman who Bob Marley is by singing a part of the song "I Shot the Sheriff." He also sang this part of the song (with a similar voice imitation) in his role as Will in one of the episodes from the series "Fresh Prince of Bel Air".
Trivia: A great deal of Flint Marko/Sandman's storyline was edited out of the film by the studio due to the long run-time. One scene early in the film showed that the scientists who accidentally created Sandman were racked with guilt when they discovered they might have activated the machine with a person inside of it. Another scene had Sandman visiting a doctor researching his daughter's rare disease whom he had been corresponding with in prison. Yet another scene showed him following his daughter in a park, and morphing into a giant sandcastle that she plays with. And finally, his daughter was going to appear in the final battle, and would appeal to her father to stop hurting people and living a life of crime to get money, as she accepted that she was going to die no matter what. Her words would be what convinced him to seek forgiveness from Peter for accidentally killing Uncle Ben.
Trivia: When the movie played in theaters, there was a scene where Dr. Catheter begins to tell Billy about the gremlins before the movie is interrupted by gremlins until they are threatened by Hulk Hogan. When the movie was released on VHS, the scene was changed to static appearing and gremlins constantly changing the channels. This caused many people who bought or rented the movie to think there was something wrong with the tape and took it back to the stores they purchased it from.
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: Jimmy's dog is named Goddard. American physicist and inventor Robert Hutchings Goddard (1882-1945) developed the first liquid propelled rocket engine in 1926.
Trivia: The infected identify each other and the uninfected by sense of smell.
Trivia: The TV edit of the film differs widely from the theatrical release - lots of footage was purposely edited out, such as when the dead Norwegian on the table blinks, and there is also a narration. Director John Carpenter has publicly stated that he finds the TV edit embarrassing and a disgrace to his movie.