Factual error: Before arriving at Brod station the train goes through high mountains. Between Belgrade (Serbia) and Brod (Bosnia and Croatia) it is all flat with no mountains around.
Factual error: The Saint steals gold. One gold bar in this movie measures 30cm x10cm at the base and 7 cm high with a 10 degree draft angle. That means about 2.1 liter size and weight of 40 kg for one gold bar. The Saint moves bars with one hand from the briefcase to the backpack, can run and hit etc. The backpack would weigh 240kg and somehow a man runs off with it one one hand. (00:07:00 - 00:11:50)
Factual error: The heist took place in April 2015 but the car registration plate of the ex copper is a "16" plate, which wasn't available until March 2016.
Factual error: The entire NYC subway platform/subway knife fight between John Wick and Cassian appears to have been filmed in the Port Authority Trans-Hudson (PATH) system that goes between NYC and NJ rather than the Mass Transit Authority (MTA) subway system (you can actually see the PATH logo on the exterior of the train cars). The PATH does not go to any of the subway stations announced on the public address system during the knife fight. (01:18:45 - 01:22:50)
Factual error: The black leather chair of the Home trust banker is more modern than the movie setting in 1922. (00:59:35)
Factual error: The opening shot is of a somewhat long and quite high bridge with an equally high waterfall behind it. After a couple views of the surroundings, Henry and Peter are standing in the middle (portion) of a stone barricade/wall (extension of the bridge?) with a huge lake behind it, waiting for the school bus. There's absolutely no legitimate or rational reason for such a location to be a school bus stop! School bus stops always have safety in mind, and this bus stop is anything but safe. (00:02:32)
Factual error: Ben states that the temperature is -6'F. When the officers drive to Matt's camp the gravel road is quite slushy. This would not happen in freezing temperatures. (01:03:10)