Continuity mistake: 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.
Suggested correction: It's possible that Nando continued shaving (offscreen) while they were living at the plane, but gave it up (or left his razor behind) during the trek out of the mountains. In real life, some of the survivors did shave while in the mountains.
Revealing mistake: At the beginning of the "Day 50" scene, there is a shot of the "human" meat thawing - in the top right of the screen, a pig snout is visible. (01:13:00)
Suggested correction: There is no pig snout. That is the end of a sleeve that has meat in it for their trip.