@Kasumi
Thank you for correcting me on that transparency stuff -- I had heard somewhere that depending on the type of layer it was drawn on (i.e. sprite vs tile/bg) that transparent color could be opaque. However NES stuff used to be pretty ambiguous to find clear/accurate info on how the games worked internally, so thank you for clearing that up!
And thinking back on it hard, I do remember the face flickering separately once or twice in the early Megaman games, but I just thought that was a glitch or something, so that image is right on the money. That said, I had heard the flickering was a way to overcome the sprite limit, but never understood the why. Thanks to you it makes a lot more sense now.