Carrie Brownstein puts in a good word for flubs in recorded music.
Voices, guitars and drums are really expressive instruments for the same reason that they’re really inexact instruments: [You] can’t coax the same note or beat out of them exactly the same way twice, even if you try.
Any stage actor could tell you that, and ruefully.
She mentions, as an exemplar, Denny Doherty’s early entrance for a chorus of The Mamas and Papas’ “I Saw Her Again.” Heck, I always figured that he meant to do that. It was effing brilliant.