When Mesrine daughter was young, she had a dark complexion. When older, she has a light complexion.
When Mesrine drinks champagne with the commissaire Broussard, he holds the glass in his right hand when filmed from the front, and his left hand when filmed from the back.
At the kitchen table, the boy has his right hand at his mouth and is about to eat at 59:51 but his hand is lower in the next shot.
At 1:31'34", the position of Mesrine's tie when he is thrown on his back on the bed.
At 1:00'41", the position of the coffee mug in Nesrine's hand while at the kitchen table (holds the handle, then handle on the other side in the next shot).
Nesrine applies a tourniquet above Besse's wound in the leg. A well applied tourniquet will stop the arterial flow down the leg and would make it impossible for Besse to walk for more than a few minutes. A badly applied tourniquet (not enough pressure) will do nothing. Nesrine should have applied pressure (with his belt) directly over the wound.
In the London scene, the production have chosen to play 'London Calling' By The Clash to illustrate Meshrine is in London, problem is, the number wasn't released until 7 December 1979, and the album a week later, at that time Meshrine had been dead for over a month (November 2nd 1979)
In the first London scene, the red bus has two posters: one for a non-existent film, "Dawn of Evil", and the other for "Tropical Tours". The film poster states "Now playing in theaters (18);" theaters is an Americanism, and wouldn't have been used in the UK, and the 18 certificate did not exist in the 1970s. The telephone number on the other poster is impossible: (01) 7966 0966 has too many digits; London telephone numbers at the time were in the format (01) xxx xxxx.
In the first shot of the sex scene with Sylvia, she can be seen wearing her panties. In the shots that follow she is fully naked.
When they are in London the apartment is almost certainly French. The style of white beveled tile is never used in British kitchens.
Broussard's "chin strap" beard is obviously fake and does not match the actor's real facial hair as seen in the movie Tueurs (2017) for example.
Where Mesrine's car stops at Porte de Clignancourt is painted on the ground a space for bicycle stop at traffic lights. These spaces have been painted since 2000.
Mesrine, Bauer and Dallier are near a newsstand. Beside, there is a street plan in which a Ford Ka is reflected. A bit later, the three men get into a car which is parked 20 m in front of a Renault Express. Both these cars were launched later than 1970s (1986 for Renault, 1996 for Ford).
In the last scene in porte de Clignancourt, one may see behind commissaire Broussard a 'Kentucky Fried Chicken'. Kentucky Fried Chicken restaurants did not exist in France in 1979.
When policemen are looking for Mesrine and Besse, one may see from the air their buses stopped beside a freshly mowed wheat field. Straw is packed in round and wrapped in black plastic (French name for this is "embubanage"). This technique was not invented in the 1970s and straw was squared packed.
The registration plate of the Peugeot 504 of the Normand family has 3 letters. This was possible only on Paris registration plates at that time.
The audience can hear a soft kiss by Nesrine at 1:38'40" when a close up shot of Nesrine and his girlfriend is shot but his lips open too slowly to be able to produce any sound.
When Mesrine arrives in Deauville, there is a sign about Deauville entrance with an N13 cartouche. National road 13 does not go to Deauville.
When a freshly-escaped Mesrine and Ardouin get on the metro, they are shouting at each other and at the passengers, and brandishing pistols, but the extras playing passengers just look bored rather than terrified.
Besse does not take the opportunity to tend to his wound while accommodated by the French rural family, and then feels the need to apply a tourniquet instead of having wrapped the bleeding injury with dressings.