Corrected entry: When the mariner questions the woman about the little girl's drawings, she says "she's like a mirror, she draws what she sees." Later she claims the mariner "has things no one else has seen" like "that reflective glass". What do you think a mirror is, woman? And why do they have "normal glass" and not "reflective glass"?
Corrected entry: Wouldn't the Jet-Ski's be useless as there wouldn't be any fuel available for them if all the land is flooded in water?
Corrected entry: At one point, the mariner trades a handful of dirt for water and a potted plant that has more dirt in it than he originally traded.
Corrected entry: At the end of the movie, when Costner and friends do find land, it turns out to be Mt. Everest. This establishes the sea level at that time. Using that and going back to the middle of the movie, we see Costner diving into the ruins of a city where skyscrapers are evident. The tallest skyscraper is approximately 1800 feet high, which would leave a difference of, say, 4 miles underwater. It would be pitch black at that depth and the water pressure would kill a human that far down, gills or no gills.
Corrected entry: If dirt is so hard to find, why are all of the characters so filthy?
Corrected entry: Can planes, boats and jet-skis run on plain crude oil? There's no real petrol ever mentioned.
Corrected entry: Since Earth is covered by a salty ocean, fresh water is treated as a rare, expensive commodity. This makes no sense, because the human body requires a certain amount of fresh water each day just to survive. If whole populations are sustaining themselves, this means that they have access to fresh drinking water reliably each day. Regardless of how people ration their fresh water, it won't be enough to sustain all those people for a year, much less through generations of people so that they would forget about the flooding of cities.
Corrected entry: The Exxon Valdez is designed to carry crude oil. Crude has to be refined into higher octane products to be used in jet skis, automobiles, etc. The refining process is difficult and requires large amounts of power. It would be impossible to do on the tanker itself. And it is extremely unlikely that the smokers would have come across high octane products on another ship. They tend to be refined near to their consumers and not shipped around.