Let's assume we live in a simulation, but for whatever reason the physics of it are not modelled perfectly. Perhaps the computing power is insufficient to reproduce everything with 100% accuracy. Let's say that as you look at smaller and smaller things, the simulation begins to give approximations instead of doing the mathematically rigorous calculations needed. Could you tell that something was wrong? Is there any way you could realize what was really going on? Would you just assume your theory needed more work? When could you ever give the simulation answer as the most likely explanation? What if the programmers used realistic physics but made exceptions here and there for their amusement, or to see how you would react? What if their physics says that everything operates according to the consistent set of rules EXCEPT for this one star which will be 1,000 light-years wide, bright green and emits gumballs along it's equator. It goes totally against the known laws of physics for no apparent reason. Assuming you didn't just assume you were insane, what would be the thought process? What if it was more subtle than that, like a star that had higher gravity than it should?