Displaced Gamers has recently released a multi-subject video discussing different revisions and bugs in a handful of cartridge-based games. The whole premise of the video was to focus on how companies dealt with fixes in an era when patching didn’t exist: Once that cartridge was shipped to consumers, the game would forever play that way.
It was interesting to see the difference in Zelda versions and I was happy to see the PCE Ninja Spirit bug highlighted; Just recently, people discovered that the high pitch noise during certain quiet scenes of the game turned out to be the wrong register being called to in the code.
No more spoilers though, check out the video yourself!