Continuity mistake: When Catherine enters the precinct station, the desk sergeant places a small white file box on the counter. There's nothing else sitting next to this, but when the shot reverses, a tall black police radio with an antenna sticking up has appeared there.
Continuity mistake: The gold coin Vincent finds on Catherine's balcony changes from one scene to the next. When he picks it up, there's a very small section of it missing on one edge. When he shows it to Father in the following scene, nearly a third of it is cut away.
Question: Kind of a long question but please bear with me. In one episode, Catherine and Vince have to rescue a boy who was being chased by a man who murdered his father. The boy claims to have a letter from his father detailing a crime that occurred and how he was killed for betraying the man. The end of the episode has the boy reading the letter out loud in court. The judge asks to see it and after a quick look over, he gives it to the man who was after the boy. When the man looks at it, there's nothing on the paper but squiggly lines. The judge then has the man arrested for murder. Why would the judge do this? There were no witnesses. All they had was the word of a boy and a piece of paper with nothing but wavy lines on it. No real evidence was presented to the judge at all.