After 70 days in the Andes, Nando has not grown a beard. Two days later, when they come with the choppers, he's managed to grow quite a nice one.
The guy who first follows Parrada and Canessa on their expedition to find Chile is nicknamed Tintin. In one of the most famous Tintin albums the cartoon hero goes to the Himalayas to find a friend who is reported dead after a plane crash in the mountains. Most likely a coincidence, but still notable.