Whenever I read about stuff like that, it reminds me that a simulation would probably have some kind of 'lazy calculation' mechanism that only calculates someth

Whenever I read about stuff like that, it reminds me that a simulation would probably have some kind of 'lazy calculation' mechanism that only calculates something when it is actually needed. It makes no sense to simulate every particle in the universe if not every particle is actually observed. But if people do indeed notice such a glitch in reality, maybe there is a way to exploit it? How can it be determined whether something is observed?