I'll do ya one even better (k, maybe not). During the S3&K ending medley, the lead instrument in Flying Battery Act 2 repeats the first "verse" twice. The last note for both verses should be A4 and E5 respectively. Instead both verses end in A4. In 20 years, I think I've seen only one other person mention it (and even that was in response to me mentioning it, if I recall correctly). To be fair though, it's pretty easy to miss if you're not paying much attention; hell, I didn't even notice it until I was bored-ly listening to the wave files from the S&KC screensaver folder some time in the early 00's or so. I'd beaten the Gen/MD version several times up to that point and never noticed it (and this mistake doesn't exist in the S&KC version of the medley for either the GM or FM Synth versions).