Continuity mistake: Just after the siege in the opera house has begun, the scene cuts back to the truck with the SWAT team inside. The driver is shown with his head turned to the right to face the man in the passenger seat while he says "Wake up the Americans." The camera then changes angles and the driver is suddenly looking forwards out of the front window. (00:01:25)
Continuity mistake: At the opera siege in Kiev, one of the terrorists in the background is shot and downed. Two seconds later, in a different shot, he is still standing and being killed again. (00:04:14)
Continuity mistake: When the Protagonist is being questioned on the train tracks by the Russians, the driver removes a cyanide capsule that the Protagonist had hidden in his uniform. In one angle, he is shown holding the capsule with two fingers and one thumb around the bottom half of it. When the shot cuts to a different angle, he suddenly has one finger positioned on top of the capsule. (00:07:23)
Continuity mistake: Just after the Protagonist has had some of his teeth pulled out by the Russian driver, the driver begins turning the time on a clock back by one hour. He is shown holding the clock with his right hand, and is shown turning the time back with his left hand. But in the next shot, he is suddenly holding the clock in his left hand and his right hand is at his side. (00:08:10)
Continuity mistake: When the Protagonist is on the boat and is talking with the agent, just after the agent first mentions Tenet, he says "It'll open the right doors, but some of the wrong ones, too." Whilst he says this, the Protagonist is shown looking straight forwards out to sea, but when the camera changes angles, he is suddenly looking at the agent. (00:10:40)
Continuity mistake: When Barbara asks the Protagonist which bullet is which, when Barbara "picks up" the backwards gun, the bullet is fallen over on the table, indicating it's been dropped. (00:14:31)
Continuity mistake: When the Protagonist is on the phone with the contact in Mumbai, just as he says "We live in a twilight world", two men are walking past him. One man is wearing pink robes and the other is wearing a black and red checkered shirt. A closer shot of the Protagonist is then shown, where the two men are shown walking past him a second time. (00:17:45)
Continuity mistake: When Neil first sits down next to the Protagonist, he is looking forwards whilst he starts talking, but when the shot cuts, he is suddenly looking at the Protagonist. (00:18:18)
Continuity mistake: When the Protagonist and Neil first meet in the hotel, just after Neil puts his hand out to be shaken, the Protagonist begins to reach out his hand for the two to have a handshake. In one shot, the Protagonist is sitting back in his chair, but when the two shake hands in the next shot, he is suddenly leaning forwards, then in the next shot after that, he is suddenly sitting with his back against the chair. (00:18:26)
Continuity mistake: When the Protagonist has Sanjay held at gunpoint, he says to Priya that if Tenet is important to her then she can tell him, to which Priya replies not while he has a gun pointed at her husband's head. The Protagonist then pulls the gun away from Sanjay's head and begins to step back. It then cuts to a shot focusing on Priya, and the Protagonist, shown standing on the left corner of shot, is suddenly standing completely still and motionless. (00:22:20)
Continuity mistake: When the protagonist is at Priya's terrace after menacing her husband, the position of her hands is not continuous between shots. (00:22:35)
Continuity mistake: At the start of the scene where the Protagonist is having dinner with Kat in the restaurant, there is a shot from behind him where he says "Traced it back to Arepo", and he is shown clasping his hands. It then cuts to a shot from in front of him where his hands are now placed on the table. (00:28:20)
Continuity mistake: When Kat and the protagonist have dinner, his hands swap between crossed or not depending on the shot. (00:28:32)
Continuity mistake: When the protagonist has dinner with Kat the glass in her hand appears/disappears randomly between shots. Also, the position of her hands is not continuous when the scene starts. (00:28:50)
Continuity mistake: When the bodyguards have the Protagonist cornered in the kitchen, they place his hand on a chopping board. In one shot, just as one of the bodyguards raises a utensil he is holding to hit his hand with, the Protagonist is shown raising his fingers slightly, right before the shot cuts. It then cuts to a different angle where his hand is now flat on the chopping board. (00:32:40)
Continuity mistake: When Kat is talking with her son outside the school, just as she says "We will. We'll go together", a schoolgirl and her mother are shown walking past Kat, on her left. It then cuts to a closer angle of Kat and the mother and daughter have suddenly disappeared. (00:33:40)
Continuity mistake: The emergency slides on the 747 that the team use to kick out the pilots disappear after they are deployed. Certainly they would be visible when the plane crashes into the building. (00:41:15)
Continuity mistake: Just before the plane is about to crash into the Freeport, there is a shot of Mahir climbing down an emergency ladder, but when it cuts to a wide shot of the plane headed towards the building, Mahir has suddenly disappeared from the ladder. (00:42:10)
Continuity mistake: When the Protagonist and Neil are standing in the hallway after averting the halide gas, Neil says "There's someone in here with us", and is shown standing right next to a wall when he says this. In the next shot, he is suddenly standing next to a bend in the wall. (00:44:05)
Continuity mistake: When the Protagonist and Neil walk into the two rooms with the turnstile in the Oslo Freeport, just after the Protagonist tells Neil not to touch the bullet holes in the window, Neil asks "What the hell happened here." At this point, his head is turned about 90° to the right. In the next shot, his head is turned more forwards and much less to the right. (00:44:50)
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.