This is deja vu all over again, as I think maybe this has already been posted before? It seemed quite familiar to me when I 'discovered' it.
There's a definitive black line/hair hitting Carl's hat on a good number of these cards. Seems to me it probably wasn't corrected, so to speak, but the print sheet had the card in two different positions, one with the black line and one without, and (based on a quick look at COMC) the cards were seemingly printed in equal numbers...
1971mortonhair.jpg