That really doesn't look like a crack on the lug to me. It looks like the original construction was with super plain "hosepipe" style stamped lugs, and they added "ears" on them to make better looking lugs. I might be wrong, but that's what it looks like to me, and what you're seeing is them (very) imperfectly joined, and the resulting seam. I'd just ride it and keep an eye on it.
I can't see anything on the dropout, but the pic is sort of dark and isn't showing up very well on my laptop.