Noah only had three sons, not four. Before the flood, there was a moisture circling the earth. The earth was not a desert before the flood. There are so many discrepancies. At the end of the movie it showed Noah back at the same place he built the Ark. After the flood that place would be totally unrecognizable. Plus he landed on Mount Ararat. The only people on the Ark were Noah and his wife, his sons and their wives. Not hundreds of other people too! Shameful movie.