I noticed this thick, green streak running across Jim Hunter's jersey on his 1966 card, so I started looking through ebay, etc., to find other examples, but I came up empty. The exact same photograph is used in a number of places, but it is a stock photo, so it's probably just a weird (one time only?) printing aberration that just happened to wind up being photographed for eternity.
1966jimhunter2.jpg
But here's where it got interesting (yes, I guess I'm playing fast and loose with the word "interesting"). Another variation suddenly appeared to me. On a small number of these cards, there is a relatively large, glowing orangey shape near his armpit. It is a recurring defect and seems to emerge from the coloring of the player walking in the background.
1966jimhunter.jpg
So grab 'em up while you can!!