While the Serbian police vehicles have 'politsiya' ('police') written with Cyrillic script, it is not Serbian Cyrillic, as this form does not have "backward R".
The Serbian police vehicles have the word for police, politsiya (policija), painted on them in Russian Cyrillic when it should be Serbian Cyrillic. Serbian also uses the letter Jj, but doesn't have "horizontally flipped R" like Russian does. The word should therefore be written with '-ja' at the end, not with "flipped R".
As the robbers walk around Belgrade, the screen caption reads 'Belgrade, Yugoslavia.' In real-life 2002, Serbia and Montenegro had formed the '(State Union of) Serbia and Montenegro', abolishing the term 'Yugoslavia'.
When towards the end of the film the robbers walk around the Serbian capital of Belgrade, the screen caption reads 'Belgrade, Yugoslavia.' That same year, in real life, the remainders of Yugoslavia - Serbia and Montenegro - changed their official name to '(State Union of) Serbia and Montenegro'. For mitigation one could argue that the film is set at a time before 2003, or production barely overlapped real-life political events.
At the airport supposedly in the United States, many Yakolev and Tupolev models which do not fly into the US are seen. These aircraft would be common in Bulgaria, where the movie was filmed.
Various vehicles supposedly in the United States bear Bulgarian license plates.
Billy mistakenly refers to a Tupolev aircraft as a "Tupolov".
Matthewson says, "Worldwide, more 747s are in use than any other aircraft." Among passenger jetliners, the Boeing 737, rather than the 747, has enjoyed this distinction for many years.
When the rest of the team is entering through the wheel well in the 747, Sophie is wearing a respirator designed for particulate-heavy environments, not for low oxygen environments.