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To be sure, this is not the genial, grandfatherly Noah charmingly evoked by John Huston when he led an orderly assemblage of animals into the ark two-by-two in his 1965 epic The Bible. Crowe's Noah is a fighter, a survivalist and yet a tortured man dismayed by the ruin brought upon the land by the others of his species. In a visit with his ancient grandfather Methuselah (Anthony Hopkins), the men agree that, “It's men who broke the world,” and that, as a result, the Creator will destroy it....

.... by far the most startling apparition in this context are the Watchers, the so-called Nephilim, or fallen angels only glancingly mentioned in the Bible. Here they take the form of giant, ferocious-looking rock people (given great, gravelly voice by Nick Nolte, Mark Margolis and Frank Langella, no less) who not only come to Noah's aid by doing the heavy lifting in building the ark but cut down, stomp on and otherwise decimate the hordes who eventually besiege the ark in hopes of climbing aboard at the last minute.

the Watchers, the so-called Nephilim, or fallen angels only glancingly mentioned in the Bible. Here they take the form of giant, ferocious-looking rock people (given great, gravelly voice by Nick Nolte, Mark Margolis and Frank Langella, no less) who not only come to Noah's aid by doing the heavy lifting in building the ark but cut down, stomp on and otherwise decimate the hordes who eventually besiege the ark in hopes of climbing aboard at the last minute.

How hard would it have been for him to check his facts?

The Nephilim are not the fallen angels, they are the sons of the fallen angels with the daughters of men.

Genesis implies very strongly that the Nephilim would have been much more likely to oppose Noah than support him. That the violence and evil of the world of their day was largely perpetrated by the fallen angels and their offspring, the Nephilim.

There are other ideas on who the Nephilim and the "sons of God" were, but this is the one I buy into.