My biggest problem as an MMA fan...
Ok theres a lot of things in this film that are unrealistic but a lot of the fight scenes and things are on the whole not too bad which is why it made me kinda angry to see a glaring error in the final fight scene, pretty much the most important part of the most important scene of the film.
I am referring to the standing guilitine choke the bad guy has the good guy in at the end, first of all this is one of the most basic submission moves to pull off in MMA most people instinctively target someones neck if they try take them down so its particularly odd to see the BEATDOWN champion and supposed expert fighter completely fail at it when we've seen him do far more complex techniques throughout the film.
When the camera cuts to sideview of the fight he has one arm around good guys neck and his other arm just flailing at his side while he screams like an idiot. In order to be choking his opponent he would have to lock his arm that is around the neck onto something normally it would be clasping his hands together but could grab his own arm, this applies pressure to opponents neck and stops opponent from breaking free. As it is there is absolutely nothing stopping good guy from using both his arms to yank bad guys one arm away or pick him up and slam him or do whatever he likes really and also there is nothing choking him anyway making the whole almost blacking out thing a mute point and also why some random dude in the crowd is yelling for the good guy to tap out to the absolutely non threatening hold i have no clue(especially stupid idea since its a streetfight and the guy has just put his best friend in hospital in an unprovoked assault just to fight the good guy).
Surprised no one has picked up on this at all pretty glaring error to anyone with even basic MMA/BJJ knowledge.