During the pool hall scene involving Anton Maric and Ray Stanton, the broken end of the pool stick changes form from scene to scene when it's pressed against Ray's face.
People standing on ground where there has been a fuel spill do not instantly combust as was depicted.
A handgun wound to the upper shoulder (revealed later when the detective was treated) would not be instantly incapacitating as was shown. Similarly, Lola's wound was later shown to be a graze, which would not have been as severe as was shown.
During the pool hall scene between Ray Stanton and Anton Manic, you can easily tell from the close-up of Ray's face that the broken end of the pool stick is made from a foam like substance which is revealed by the flexibility during a light drag across the cheek.
When the detective pulls and is approaching the car at the meetup, a gun cocking sound is heard. The detective is carrying a hammerless gun that cannot make this sound.
The gun thug chases Lola to the field and sees she is lighting the spilled fuel on the ground. All he needed to do was step out of the area where the fuel had been poured- perhaps 2 or 3 steps- and he could have easily ganked her.