I call them “knuckle dents” because that’s what they look like, and knuckles are what caused them. They’re really fractures from childhood. They are more visible in certain light, but here is one on the left side of my skull.
A lot has changed since the late 1980s. I can now run Thunder Blade off of a flash cartridge (EasyFlash3). And in general I’ve grown so cynical of in-game product placement that it’s not even funny.