While talking to the Mendozas before they leave for their picnic, in the first shot Juanita is leaning over a map with both hands on the table. In the very next shot she is standing straight with her hands in her pockets.
The position and numbers of the pencils in the mug on Jarré's desk, when Picard interviews him, varies between shots.
Andre puts the "money" in his left breast pocket, but when he goes to retrieve it at the florist, he retrieves first the drawing (which is still also in his left breast pocket), but then pulls the envelope with the money out of his right breast pocket.
The calendar in Philippe's office is labeled "September 1962" but one day later Andre is reading a newspaper dated in late October.
When Dubois and Uribe go into the bathroom to discuss obtaining the briefcase there are two Cubans sitting in the corner opposite the door. When Dubois and Uribe come out of the bathroom, the two Cubans are no longer there.
The September calendar in Philippe's office begins on a Tuesday, but in 1962 that month began on a Saturday.
Later in the film, as the camera pushes through the open front door into the house party, the closed door to the left of the screen can be seen to slide out of the way before it has gone out of shot (allowing the camera to continue forward).
As the camera, suspended on a ceiling track, follows Rico Parra down the crowded hotel corridor in New York, one of the hanging lights can be seen to suddenly disappear upwards before it has gone out of shot (allowing the camera to continue forward).
After Juanita de Cordoba falls to the ground dead having just been shot with a .45 semi automatic, we see the hammer of the pistol down and not cocked. The slide would re-cock the hammer to be ready for the next shot or stay locked back if there were no more bullets in the clip.
At 0:12 as the plane taxis to a stop, the film speeds up to perhaps double normal speed.
At the end of the movie, a figure enters a building, closing the door behind him. The film then freezes, evidenced most clearly by a scratch in film on the door frame. The scene then gets larger, as if the camera was moving closer or zooming in, but it only magnifies the graininess of the film.
At the end, when Nicole realizes she saw Jarré walk out of Granville's house, she remembers Devereaux saying "And if you had arrived later, you would never have seen him." and we hear that line in voiceover. However, Devereaux never actually said that line in the movie previously.
A shot during the May Day parade sequence at the beginning of the film clearly reveals the parade to be taking place during the 50th anniversary of the October revolution (around the 1:29 mark), putting it in 1967 as opposed to 1961-63 when the story is supposed to have taken place. Therefore a person watching this parade could not have possibly defected to the USA and warned them of the Soviet missile deployment in Cuba (as is claimed in the beginning of the film).
The Kusenovs arrive in the US in a USAF C-135 marked "Military Airlift Command". The movie is set in 1962 but that organization did not come into existence until 1966. The aircraft should have been marked "Military Air Transport Service".
After Andre returns from Cuba, his French supervisor states "I sent Peugeot to Dulles Airport to meet you". The first airline flight from Dulles was on November 19, 1962, 3 weeks after the Cuban Missile crisis (October 14, 1962 - October 28, 1962) ended.
Many cars in Copenhagen street views are too modern for 1962, like a Ford Transit Mark 1 box van from 1965 onward and the getaway limo, a Mercedes W110 Lang 7 seat produced first in May 1967, among others.
When Devereaux and his family arrive at the St. Regis Hotel in New York, the awning says "St. Regis-Sheraton." However, the hotel was not part of that chain in 1962. Sheraton did not buy the hotel until 1966, four years after the film is set.
At Jaques Granville's party when Deveraux is setting up the meeting with his colleagues, he says, "So that's five people who can help me." The line is obviously dubbed as he clearly mouths the word "six".
In the porcelain factory, after breaking the statuette, Tamara Kusenov goes through a door to make a telephone call. The goon following her moves towards the door, now closed, to investigate it, and the shadow of a man appears briefly on the wall to the left of the door before we cut away from the shot... and it is not the shadow of the goon...
When Andre and Michele go to Jarre's apartment looking for Francois, you can see Michele's reflection in a large mirror as she leaves the frame. A moment later, another figure enters and quickly leaves view, reflected in that same mirror.
In the scene with the Soviet military parade, the archival footage of Lenin's mausoleum is reversed, with his name appearing backwards.