1) The vocals have a very long verb that sounds like it has a slight (20ms) predelay on it. The verb is a little on the bright side but still fits the track well.
2) There's a timed delay also on the lead vocal in addition to the reverb. Listen to how band-limited it is. Hard to tell if this was the result of a tape delay with a worn out tape or one of the then-new digital delays that were intentionally filtered, but either way, there's not= high end at all on it.
3) The harmonies are very tight - maybe too tight, in that it sounds like they got one perfect then just flew the rest of them in on all the other spots in the song as needed. That's no big deal today since you can easily cut and paste in your DAW of choice, but don't forget, this song was recorded way back in 1980 in the days of magnetic tape. You had to do this kind of thing manually, which was a process we called "flying it in" back then.
4) Steve Perry's voice is wonderfully glorious, soaring to the heavens as always. That's why it so unusual to hear a flat note that was left in at around 1:20. Obviously it didn't hurt the popularity of the song any. I can't say I ever heard it before listening to the isolated vocal track.
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