I appreciate similarly the inclusion of details that are not red herrings and oversights that are not plot holes because not everything in a life is dramatically significant; sometimes people slip up, sometimes cars have janky transmissions, sometimes a conversation never comes off the wall.

Alyc and I had a recurrent debate over an instance of this in the first Rook and Rose book. We wrote a line of dialogue for a character that, we later realized, was her accidentally telling a truth that contradicts the lie given before; it happes in a context where no one is paying enough attention to call it out. I slightly regret that we wound up changing it to something that can be read more ambiguously, but in the end, we were too concerned that readers might interpret it as a mistake on our parts, or be waiting for a payoff that would probably never come (because the likelihood that anyone in that scene was going to remember the slip-up and call it out in the second or third book was low). But that kind of thing happens all the time in real life, and I'm a little sad that we didn't stick to it.