Megatherium (the giant ground sloth) lived in South America, not North America. Ground sloths were also only capable of walking on the sides of their feet (hindlimbs) and on their knuckles (forelimbs), as they would not have been physically able to walk all flat-footed.
When everyone is discussing possible landing areas, someone points out a empty strip of land a mile away from the clearing. Since the rescue plane is a VTOL air frame (vertical take-off and landing), the pilot could just land in the clearing.
When the group are gathered around a campfire discussing feeling hungry, Scott makes a reference to the movie "Alive" (1993), describing it as being about a soccer team. "Alive" was about a rugby team, not soccer.