Still going off the rails with Beatles mistakes (which I think are great, actually. It shows genius prevails over perfection). If you listen to "Eleanor Rigby" on earbuds, you can hear Paul's vocal in the first verse go from two channels to one. It's only for one syllable, but it's there. Apparently someone had to physically "pot" down from the multi-track mix of the "Ah, look at all the lonely people..." intro into the solo vocal and whoever it was missed it by a tiny bit.