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: 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)
Visible crew/equipment: After exiting the turnstile, Sator looks through the window separating the two rooms and watches his past self interrogating the Protagonist in the opposite room. In the shot where his past self is shown hitting the Protagonist across the head with his gun (in reverse), the wheels of the camera dolly can be seen reflected in the window to the left of shot. (01:24:45)
Audio problem: When the Protagonist and Priya are talking whilst walking down a street in Mumbai, just before the scene ends, Priya says "Sator's helping. You have to find out how", but her mouth doesn't move along with the line. (00:50:55)
Factual error: When first sucking a bullet from the wall into his gun, he then opens the previously empty magazine to find the bullet. Given he didn't work the slide (forwards or in reverse), the round should not be in the magazine, but in the gun's chamber ready to fire. (00:14:00)
Visible crew/equipment: After going through the turnstile in Oslo, the Protagonist walks up to an ambulance, knocks out the driver and steals it. When he begins to drive off, the shadow of a huge stage light can be seen cast on the side of the ambulance. (01:44:34)
Other mistake: When the protagonist is making the exchange via the BMW and tries to slip the Algorithm into the passing car (himself), the window of the car is up, so there's no way he could have thrown it in. (01:19:55 - 01:33:55)
Other mistake: In the theatre/opera scene the whole hall full of people are put into sleep with gas attack. They pass out in seconds. A minute later the compromised agent jumps from the private room to the same hall without any oxygen mask... and is completely fine. (00:02:30 - 00:03:50)
Audio problem: When Neil is being guided around the Freeport area, just after he says the documents are vulnerable to water damage from the sprinkler systems, the Freeport worker tells him they don't use sprinkler systems. The worker then says to him "The facility is flooded with halide gas", but in the shot where he is heard saying "halide gas", his lips do not match up with the audio heard coming from his mouth. (00:36:18)
Visible crew/equipment: When Mahir and his partner get on the plane, and they put the guards to sleep with chloroform on the face in the scene of the crash, the shadow of the camera entering the aircraft can be seen on the right side of the screen next to the airplane's entrance. (00:39:27)
Continuity mistake: In the highway chase scene where Sator reaches the Protagonist threatening to shoot Kat if he doesn't give him the case with the Plutonium-241, he lowers the window, but when he's watching the inverted car overturned which is going to get up and move backwards, the window is closed. Then when he's going to give the case to Sator, the window is lowered again. (01:19:52)
Revealing mistake: When the Protagonist and Neil are walking through the Freeport area whilst the plane is being hijacked, just after the worker fills in the numbers on a keypad and opens the door to the vault, he walks through and is followed by Neil. The Protagonist is shown holding a small cup of espresso and briefly looks around before walking in with them. The interior of the cup can be seen when he does this, and there is no liquid inside of it. (00:40:12)
Visible crew/equipment: When the Protagonist passes through Sator's turnstile to return to the ambush site on the highway and gets in the inverted car, a cameraman holding the camera is reflected on the wing mirror. (01:31:38)
Other mistake: In the end credits, the cast is listed in order of appearance, but the listing of some cast members is inconsistent with how they first appear in the movie. Immediately following the credit for Crosby (Michael Caine), the next few characters listed are Shipley's Representative - Kat - Max - Volkov - Gaunt Russian - Nanny. This does not match up with the movie. After the scene with Crosby, the Protagonist is shown watching Kat outside a school visiting Max, who is with the Nanny. The next scene he goes to Shipley's, where he is greeted by the representative, and in the scene after that, he goes to a restaurant where he meets Volkov and fights the Russian bodyguards. The correct order should be Kat - Max - Nanny - Shipley's Representative - Volkov - Gaunt Russian. (02:26:07)
Continuity mistake: When the protagonist's car overturns, the wide angle shows his mask on. In the immediate close-up it's off, and he is placing it back on his mouth. (01:34:11)
Factual error: Oslo Airport - Neil is talking to the Protagonist on the bus. An American Airlines Boeing 737 can be seen behind the Protagonist. AA have never served Oslo, and if they ever were to, it wouldn't be in a 737. (00:37:08)
Visible crew/equipment: When the Protagonist and Neil are in front of the turnstile at the freeport, and they notice the bullet holes on the glass, a cameraman can be slightly seen reflected on it behind the Protagonist just a moment before he tells Neil to not touch the holes.
Continuity mistake: When the Protagonist gives the case to Sator in the car chase sequence, and he and his men exit from the Audi and get on the other car, Audi's window is first slightly lowered and then up in two different shots.
Continuity mistake: When the Protagonist fights against the inverted man inside the freeport just after the plane crash, at a certain point the inverted man kicks the gun away, making it fall. The gun in the background changes position and distance in two different shots.
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.