I was hoping to be able to correct this one myself but apparently you need level 8 permissions to fix an existing checklist and I don't have that.
I found a complete list of all the cards from the different subsets and I'm finding a few that have incorrect checklists in that they aren't showing the different variations of some of the cards.
http://npshistory.com/brochures/cards-g-m.htm
The "Lowell National Historical Park" subset has 2 variations of 5 of the 6 cards in the set, one with blue/grey borders and one without.
From a quick look, I see the same with the "George Washington Memorial Parkway" subset, "Gettysburg National National Military Park" subset, "Harpers Ferry National Historical Park" subset, "Manassas National Battlefield Park" subset, and the "Monocacy National Battlefield" subset.
I haven't looked at the pictures shown for anything outside of the g-m page but I would assume that similar problems exist on others as well.