Spotted another two oddities that may or may not be present on original hardware:
1. After looking at EL POLLO DIABLO!!!!!, the music seems to skip back a few seconds each time.
2. A couple of times while doing the banjo challenge, I tried to play my note immediately after the music stopped and the cutscene for me being too slow immediately started. Normally you get a second or two so I think some timing issue sometimes reduces it to nothing. I worked around it by not waiting until the music ends.