Yes, a couple months ago I found a missing sound effect in City Connection compared to arcade board footage (missing even in the officially licensed PS4 emulated release). AJR found a line of code in the driver relating to the PSG that had been commented out from the beginning (in 0.3something), un-commented it, and the sound is now there.
CC also has a distorted FM instrument in one level compared to real board footage (not a documented bug, I was meaning to but forgot), I don't think that has ever been correct either. (Though oddly, the PS4 version, which you'd expect to just be fully cribbed from MAME due to that missing sound effect, *doesn't* have the distortion...)
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