The first telling is not usually when you get caught in a lie. It’s subsequent references to it that are just different enough that people catch the lie and silently judge you for it. With someone you seldom meet you’ll probably get away with it but behavior like that tends to also bleed into your long term relationships where it actually matters. You have to be very, very smart to be able to maintain many lies and is out of the reach of most people, at least anecdotally.