I mean I suppose if you're maintaining like wildly different identities. In general though it's not any different than remembering which stories and anecdotes you've already told people, besides which most people just don't really care to delve into inconsistencies in each other chalking it up to fallible memory on one or the other parties.

> you have to keep track of your lies, otherwise you might slip up and get caught

I wish that were the case, but it isn't. There are many other strategies for avoiding the negative consequences of lying that scale better. Society is really, really bad at holding liars accountable. Just look at President Trump -- or a couple of rungs up your corporate hierarchy.