Plot hole: Nadira hides from the bad guy behind a screen - with her feet in plain view. Then, after capturing her, the bad guy inexplicably lets her go, even though her knowledge poses a danger to him. Given that he's killed without a qualm before, this makes no sense at all.
Continuity mistake: 12-17 "A Bird in Hand": We see Angie take photos of mobster Del Vecchi with a 35mm camera. But later on, she develops the same photos and says she took them with a 110 camera hidden in her purse. She's a professional photographer and would certainly know the difference between 35mm and 110 film.