From the "Dolphin Progress Report" article (https://news.ycombinator.com/item?id=13544514): there were two Disney games that wrote garbage data to a region of memory where important data was stored, but not enough to cause the CPU to flush the cache, and then invalidated the cache, causing the writes to never actually happen on real hardware, but on Dolphin (which didn't actually implement a CPU cache in its emulation layer), it caused the writes to actually happen.