Continuity mistake: When Kat and the protagonist have dinner, his hands swap between crossed or not depending on the shot. (00:28:32)
Tenet (2020)
Directed by: Christopher Nolan
Starring: Kenneth Branagh, Robert Pattinson, Aaron Taylor-Johnson, Elizabeth Debicki, John David Washington
Continuity mistake: The protagonist, Neil and Kat are in the back of the yellow ambulance in the parking garage. Neil checks on Kat, after that he removes plastic gloves from his hands and throws them into the trash right next to him, 2 cuts later he again crumples a pair of plastic gloves. (01:46:15)
Continuity mistake: While Kat is seated on her bed on board of the yacht in her bedroom and then Sator comes in to throw her a pillow, this one bounces on the bed and falls on the floor. After two shots, the pillow is inexplicably on the bed above two other pillows next to Kat. (01:03:48)
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 747 crashing into a building was shot entirely practically, with a retired jumbo jet. Christopher Nolan costed out doing it with miniatures, but realised it would be cheaper (and better) to buy the shell of an old aircraft and really crash it.
Trivia: Features a surprisingly low number of effects shots, just 280, as opposed to The Dark Knight which had 650 and Inception which had 500.
Fay: Welcome to the afterlife. You've been in a medically-induced coma while we got you out of Ukraine and rebuilt your mouth.
Protagonist: The suicide pills are fake. Why?
Fay: A test.
Fay: All I have for you is a gesture in a combination of a word: Tenet. Use it carefully. It'll open the right doors, but some of the wrong ones, too.
Protagonist: That's all they told you?
Fay: That test you passed. Not everybody does.
Neil: What the hell happened here?
Protagonist: It hasn't happened yet.
Suggested correction: People doing procedures change gloves all the time. There is nothing suspicious about using 2 pairs of gloves in 3 minutes.
He was already done with the procedure when he removed the first pair of gloves. He was never shown putting on the second pair.
It's the same scene replayed, a true editing error.
But this scenes are within about 15 seconds of time - so there is no time to put on another pair.