From the beginning, Noah seems to favor the four-legged beasts over humans—humans that eat meat, that is. It sort of draws on the idea that man was meant to be an herbivore, but that the nurturing of evil has caused them to crave meat, to explain a small percentage of the violence of man described in the Bible and the reason for the cleansing. He sets out to build an arc to save two of every animal species because of his visions, but with each step he takes, there is a new obstacle. It plays on the well-known name of Cain, giving a man in Cain's future line a bigger part than he played in the Bible. An interesting fact in my own Bible was that Tubal-Cain's proclaiming that if Cain was cursed for killing Abel, surely Tubal-Cain would be cursed tenfold. It adds a unique possibility to the movie: Tubal-Cain's antisocial personality and his survival of the flood. The bible doesn't strictly say that most of this didn't happen.
Interestingly enough, Methuselah's part in this film seems a bit more prominent than it is in the Bible itself. In the original story, his part is mentioned strictly as the next in the bloodline after Enoch, who begat Lamech, who then begat Noah. Depending on what other religious books you've studied, though, or other media interpretations, you might remember Methuselah playing a larger part, having a relationship with Enoch, ministering to the people with Noah to convince them to change their ways, etc. Enoch, Methuselah's father, was so absolutely pure that he simply was taken into Heaven, and in the movie, Methuselah is renowned as a great and legendary warrior—a protector of the fallen angels.
Another inconsistency was with Noah's children's ages. The bible places them as already in their hundreds and two-hundreds, while the movie places them in their teens and lower. Aside from that, you won't find enough evidence in the Bible to discount everything that happens in the film. For all I know, it all happened.
The reason for my critique has been this: I recently read many articles with complaints about accuracy. I also read many articles concerning the banning of this film in certain countries. I wouldn't call it historically accurate (as the Bible tells it), but then again, neither would I call the Bible accurate. The news hype and hatred surrounding this film seems unwarranted. In fact, if it didn't so heavily take from a biblical story, I might say it makes a pretty good fantasy piece. In closing, I hate Noah as a person, but I enjoyed the Noah religious fantasy story and I thought it was quite brilliant. There's going to be plenty of action and there's going to be many questionable moments, but this twist from the everyday understanding of the interpretations makes for a definitely great film novelization. Tell me what you think downstairs.