I thought those peels, too. I'm not sure if they are just different varieties, or maybe harvested a little sooner, or older, younger, or something else, but I've had some chickpeas which had the skins come off almost without trying, while others, which seemed just as well cooked, and not "al dente" at all, seemed like they hardly had skins on them, and to get off they had to cooked longer, and got much softer. Normally, I just leave them on, but in salads, I rub the skins off, if they are the types on which the skins are coming off easily, as they come off in the salads. And when the skins are removed, the chickpeas are "brighter", compared to those which the skins are still on.