Trivia: When the apostles sit down to dine at the Last Supper they strike a pose imitating the famous painting by Leonardo DaVinci.
Trivia: The man shooting the movie during the attack on the beach who says "Don't look at the camera" is actually director Francis Ford Coppola. (00:25:38)
Trivia: In Carlotta's dressing room there is a large portrait of Carlotta holding Andrew Lloyd Webber's head on a plate.
Trivia: Miley Cyrus has a brief cameo at the end of the film in the musical number "All For One". She is seen in a quick close-up, wearing a yellow top, dancing with other people on the rocks around the pool.
Trivia: This is for the trailer rather than for the final film, but worth a look. At 1:33 in the trailer, just after seeing Rorschach slam someone against a wall, we see another fight. Pause it and look at the guy in black - he's holding a walkie-talkie, which in the next shot becomes a gun. This is only trivia, not a mistake, because it's only valid for the trailer. The MPAA don't allow guns to be pointed at the screen in trailers, so Zack Snyder, in a tribute to the infamous gun-editing from E.T., replaced the gun in that one shot with a walkie-talkie. (00:01:30)
Trivia: A popular film poster shows Emily and Victor reaching their hands toward one another. Emily's bony hand is on her right and Victor's suit and vest are backwards (note its buttons). Some say it was for legal reasons - Johnny Depp's name was supposed to appear on the poster first because of a contract, and they wanted the characters underneath the corresponding star names, hence the issue. Others say it was simply because the picture looked better with the bride on the right side.
Trivia: The bloated woman who is brought into the mall in the truck is actually played by a man. His name is Ermes Blarasin, and he is a stuntman.
Trivia: The Captain of the Iwo-Jima who Tom Hanks talks to at the end of the movie is the real Apollo 13 astronaut Jim Lovell.
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: Near the end of the film, as Dani is lifted and being carried to the dinner table, if you look closely, you can see the ghostly image of her deceased sister's face (with the exhaust hose in her mouth) in the background. It's been superimposed over the trees in the distance. It's very subtle and easy to miss, but if you know where to look, it's there.
Trivia: Stephenie Meyer makes a brief cameo appearance at Bella and Edward's wedding. She is the author of the Twilight books.