3:26 (really subtle)
I did a post on that a few months back.
It's really subtle with very fast attack, and it adjusts it a few cents, because Bruce is almost exactly on pitch, but there are some very subtle corrections.
I honestly have no idea what you're talking about. I listened to it many times and I just can't hear anything unusual.
EDIT: oh wait, crap, I htink I know what you're talking about, but I don't think it's autotune.
I think it's a chorus effect. See, I think that Bruce recorded this part 2 times, and the subtle differences between the two takes make a chorus effect, and it sounds odd to your ear. I could be wrong, but that's how I hear it. 3:37 was the best time to hear it, because just before it he does a vibrato that sounds really weird when you listen really close.