As far as appearances go, it's safest to say it's probably good thing Nick isn't actually human.

"Three - three weeks?" Daniel tears away from his distantly concentrated stare at the road to raise his eyebrows at his new passenger in mild astonishment. "Just by walking? God, how did you even manage that?"

Sure, that sort of thing isn't unheard of. And maybe he's been hitchhiking sporadically in between, who knows? Daniel still can't help but gape a little. No wonder the guy looks so rough.