Revealing mistake: The $100 bills in the briefcase looked quite fake and were obviously a prop. (00:13:40)
Other mistake: The men went to Flynn's suburban home, with houses nearby on both sides (and probably on the opposite side of the street), at night and many loud gunshots were made inside as well as outside, but no neighbors turned on lights or were disturbed. Dogs did not even start barking until the shooting stopped and Flynn was driving away. Even if neighbors heard but did not want to risk getting killed, the dogs should have started barking at the first sound of gunfire (if not when the men arrived). (00:26:08 - 00:27:49)
Continuity mistake: The white car in front of the Mustang is parked along the edge of the driveway/pavement when Flynn gets a gun out of its trunk, but is parked partially on the grass when she drives the Mustang around it. (It appears as though the Mustang was moved to the right of the screen). (00:26:54 - 00:27:38)
Continuity mistake: The amount of pain pills in the bottle was inconsistent and it isn't clear how Carlo could have managed to remove the safety cap (apparently without using his injured arm). After Carlo poured about 12 pills onto the counter, the bottle later looked just as full (if not fuller) as it was. (00:28:03 - 00:28:35)
Continuity mistake: The laceration on Carlo's upper right arm was about half-way between his elbow and shoulder, but he placed the bandage higher (closer to his shoulder). Thereafter, the bandage was about mid-point where it should have been. (00:28:14)
Continuity mistake: Before Luis Velasquez is killed he is wearing glasses, but from a brief side shot his glasses are gone.