For those into variants and errors, I just noticed one on The Black Series 6-Inch 60: Death Star Trooper figure. Early versions with Date Stamp 734XX have flat black Torsos, while figures with Date Stamps 800XX have shiny black Torsos. These are not one off variants / errors as I have multiples of each and also confirmed with other fellow collectors on which they had.
I just opened these figures up, so not sure yet if the color differences has to due with a molding issue or Hasbro is now applying paint or something to his Torso to make it shiny. I am in the process of photographing this figure, but for now you can check out a side by side pic above.