I see this on leaves on a few different plants but there are zero pests in my room aside from an occasional fungus gnat. Am I just not being gentle enough shuffling around my string net?
Fans get some damage just in general, including what im seeing with yours. What you want to watch for are symptoms spreading to the surrounding leaves. If its just local then you're okay. If you start seeing it spread to other parts of the plant, go to the "plant problem diagnosis" page on the GrowWeedEasy.com site.
The same goes for the shriveled leaves. I tend to see that with certain strains, especially White Widow, which I grow often next to a similar strain. I grow via RDWC, so all the plants are getting the same tasty soup, but the White Widow will end up with a few shriveled (especially in heavily shaded spots), but the other strain will look perfectly normal.
What you'll want to look at is the new growth to see if there are any nutrient/pH issues, or around fans showing some issues, for bug, mold, mildew, or other physical damage being caused by external issues.