I hardly ever watch TV but, on the rare occasions that I've done so, I'm often amused/amazed by the way that TV cops completely ignore the provisions of the Police and Criminal Evidence Act!
For example, I happened to be in a friend's flat when Corrie was on the box and watched a custody sergeant charge a suspect with an offence before he was then interviewed. That's the wrong way round. A suspect can only be interviewed before he's charged.
Similarly, cops such as DI Frost regularly interviewed people in their homes, without cautioning them first and without any way of recording the interviews. That just doesn't happen in real life!
Some years ago, I was travelling on Eurostar between Paris and London and found myself sitting next to a guy who was reading through a script of some sort of a police drama. I couldn't resist reading it from the corner of my eye and I found myself having to hold back my laughter at the multiple procedural errors that could be identified within just the first few pages of it. I assumed that he was a college lecturer, reading through a script written by one of his weaker students. However, when he closed the script I could see that the name of the show's director on the front cover matched the name on my neighbour's ticket. Above it was the name of the programme: "The Bill".