As far as I can tell the entire set has these variations.
The pinkish face on the blue hat is actually from them using basic magenta in the CMYK process. The cards with it aren't the easiest to find compared to the others. On Jackie it's harder to spot. On cards with a red background it's very easy.
Like the Ruth card in this screenshot.
Most or all the portraits and cards where a bat is near the border have the extra lines of color. It's deliberate, and I believe the order was.
Pink backgrounds extra color along portraits/bats
Red backgrounds extra color along portraits/bats
Red backgrounds extra color along portraits/bats Shading added to hats
Red backgrounds no extra color shading added to hats.
Since there's four colors there are also some odd transitional types.
I think the pink was changed because.... Kids didn't want pink baseball cards?
The extra bars of color were probably removed to save a bit on ink. It seems trivial but over a long press run it adds up. (Or possibly a cost tradeoff with adding the shading. It's a pretty messed up set printingwise so who knows what they were thinking. )
I made a spreadsheet for myself with as many pictures of the variations as I could find. for most cards I found 3-4 but I consider it an ongoing thing. I check through ebay etc every now and then, and usually find a "new" one.