PROMETHEUS: PLANET ZEUS SCRIPT

RE: PLANET ZEUS SCRIPT. I've read discussions where this supposed leaked early script was denounced as a fake ( but not categorically so, it seems, by Lindeloff ). But much of what happens in the actual movie happens in the script. The script perhaps fleshes out certain points which the movie fails to address. Certain characters' motives are clarified enhanced somewhat. What does concern me if the script on any level is genuine, are the copious amount of clumsy spelling mistakes and grammatical errors throughout the entire text. Surely screenwriters' English cannot be that poor. If the script is fake then how can it so closely have lined up with the finished movie? This script has been floating around for months.