When Noreen shoots Smith with the last bullet in the gun, the slide locks back as it should on a semi-automatic handgun. However in the next shot the slide is forward again.
At the very beginning of the movie, while Noreen is lounging behind the counter, there are two pies on the kitchen serving window. A short while later, Jimmy places the second pie in the window.
Noreen: I have a crappy, pathetic life. I am terrified of change. I stay when I should go. I am not very smart. And I will probably never be truly happy. But I know one thing that you don't.