Other mistake: When we see John's wife collapse in front of the bride, just as the camera cuts out of this little cut scene, the camera wobbles very noticeably. Almost as if someone had knocked it. (00:02:25)
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. (00:46:30)
Suggested correction: Maybe he's actually saying "Over 20 kilograms" in Russian. If you calculate the other way 60lbs is just over 27kgs.
Logically that doesn't make a lot of sense since the mistake is saying the translation says "over 60 pounds", so we have to assume by 20 he means over 27.6. Why not just just say "over 27 kg"? And you appear to just be guessing that maybe he says "over 20 kg" in Russian.
Watching it literally right now... he absolutely says "20 Killogramma".