Other mistake: When John is talking to the club bouncer, John says that he lost weight, to which he replies (in Russian) "Twenty kilograms." The translation says "over sixty pounds," but 20 kilograms is just over 44 pounds.
Viggo Tarasov: I heard you struck my son. Aureilo: Yes, sir, I did. Viggo Tarasov: And may I ask why? Aureilo: Yeah, well, because he stole John Wick's car, sir, and, uh, killed his dog. Viggo Tarasov: Oh.