At the end, Monica is shown to be on a 2 engine jet, yet when the plane takes off, it is a 2 engine propeller plane.
The term internal affairs is used relating to the FBI. There is no such division in the FBI. The FBI uses a division known as professional responsibility when agent misconduct is investigated.
It was shown that Gemma kept her revolver behind the bar, but in the last few minutes she pulled it from under her jacket. She could not have pulled it from under the bar since she would have had to use her left hand to do so, and the gun was pulled by her right hand. Additionally, Gemma took her purse to the back room to get the photo, so if the gun was in her purse Monica had no access. As such, Monica had no opportunity to unload it and would have been shot and killed.
On his photograph in the police station, Murphy's given name is spelled Collin. In the end credits, it is spelled Colin.