When the Gendarmerie car chases Ali at the beginning, North-American double yellow lines are visible on the road.
On the drone view, classic French discontinued white lines ("dissuasion lines") are very clearly visible.
The Gendarme approaches Ali's car alone. Gendarmes are never alone in France - always in pairs. The Gendarme asks Ali for his 'Enregistrement &...' (papers & licence). A French law enforcement officer would ask for 'papiers du véhicule' or for 'Carte Grise'. This word use would be a 'Canadian-ism'...The Gendarme speaks in '10-codes' on the radio. These are not in use in France.
While Jack Ryan is sneaking up to the shed in the forest, you hear a Great Horned Owl hoot in the background. While it could be an escaped example, this bird is not native to Europe.
The crabs Jack & his date are eating in the restaurant are not the correct kind of crabs. The crabs should have been "blue crabs" (found on the east coast, which turn orange when cooked), not dungeness crabs (found on the west coast).
At 29 minutes in, Andrews is labeled Andrews Air Force Base. The base is now a combined base called Joint Base Andrews.
When the Gendarmerie car chases Ali at the beginning, the road is obviously not French. Double horizontal yellow lines can be seen on the road. These do not exist in France.
In the opening scene which allegedly takes place in the French Alps, the road signs and center dividing line are U.S. American.
Jack and Sandrine are following Ali in France, and it is getting dark. However, in the next scene in Syria, it is sunny. Syria is an hour ahead of France and should already be dark.
Jack has told Cathy he's just a State Department desk jockey, yet when he takes his shirt off after their first date, she (a medical doctor) doesn't even ask him why a government clerk has a bandaged knife wound on his torso, nor does she take note of the scars on his back.
After leaving the restaurant, as Jack and Cathy are walking down the street, Jack stops in front of a house before Cathy tells him it's her place.