Hair

A skull from China has been tentatively identified as Denisovan thanks to DNA and protein fragments. So, given the skull, they have a reconstructed face.

Hairy.

Humans grow head hair continuously (modulo a spot of baldness: In this world of toil and sin, your head grows bald but not your chin. Burma-Shave). If you don't keep your hair clean you're apt to get vermin, and if you don't keep it trimmed it is apt to get in the way. How do you do those things without tools? Gnaw on it? And perhaps Gary Larson (Far Side) could do justice to stone scissors, but I can't. Lay the hair across one rock and drag another back and forth until the hairs are ground in two?

Perhaps it was curly like sub-Saharan African hair. It can grow quite a bit longer that way without getting in the way (hair tends to break after a while). That doesn't explain why would it grow as fast as it does, though it's another option for the reconstruction people to consider.

I don't think we started growing straight hair like mad until we'd already developed tools for dealing with it. Some suggest singeing or flint scrapers (ouch, ouch). And you can groom with mud, which would help keep the vermin down, and maybe do a bit of automatic hair breaking (effectively trimming) when the mud cracked.