Continuity mistake: After Megan shoots the thief out of the window, she walks up to look out of it, and we can see from the reflections that the window as repaired itself.
Plot hole: Megan is suspended because the police were not able to find the gun the robber had (stolen from Eugene at the scene) and believed that she had killed an unarmed man. This is very unrealistic because surely they would have interviewed all of the hostages/witnesses at the robbery and each would have easily confirmed that the robber had a gun, and possibly that Eugene might have been missing right after the incident.
Plot hole: After Meaghan's best friend was shot why wasn't the bullet matched to confirm the shooter? No way would she have not heard a gunshot 10 feet away in the bathroom of her apartment even with towel around it. No rookie would be given a temporary detective badge after a shooting.
Factual error: Megan Turner asks if there are any other people named "Megan Turner" in New York when she is being interrogated about the bullet on her name and one of the policeman says that they have found only other one Megan Turner in New York. This is beyond laughable. There would be multiple people who are named "Megan Turner" in a city like New York.