Basically anytime you have a leaf that connects to the main stem deep inside the bud, and that leaf is totally dead, you either have mold or are going to have it pretty soon. Transpiration from the bud leads to moisture on the dead leaf, which allows mold spores to germinate and spread to the living parts of the plant...
A lot of the tops on the left-side plant have such dead leaves; I would just cut my losses on that one and harvest everything with dead bud leaves now, and inspect for mold very closely before consuming. When it's dry, take the tip of your scissors and scratch any areas that look suspicious in front of a dark background. Trichomes and bits of plant matter will break off as distinct specks. If a little wisp of smoke comes out, that's mold spores.
The one cola on the right plant where there's one dead leaf and the rest look healthy (center rear) - that's almost certainly mold too, but that's the only spot I see it on that one.