Your examiners have better, more important things to do than search your thesis for errors. It’s important – for the viva, and for any corrections – that they identify mistakes, but that’s not their focus. It’s much more useful to focus on your research and the contribution you’ve made than to just look for the “bad stuff”.
You have better, more important things to do in your preparation than search your thesis for mistakes. There probably are some – typos, little slips, references that aren’t up to date, passages that could be clearer – and it will help you in the viva and for your corrections to be aware of them. But if you make them your focus you will never stop finding things you could improve. It’s much better for you to put your attention on what makes your thesis good rather than what could make it better.
Don’t look for mistakes. Look for what matters.