Overlooking the obvious ones like kids, tattoos, dyed hair etc, what are some more subtle red flags you wouldn't normally take as a red flag?

First one that comes to mind for me is a girl who travels. If she's been backpacking on a gap year, guaranteed she's been dicked down by Italian Chads, Aussie Chads, Israeli Chads, Brazilian Chads....

Bonus points if she's been to Bali, Dubai or Italy.