When Krakatoa blew in 1883, it ejected some 5 cubic miles of debris into the atmosphere, dropping the average global temperature by as much as 1.2 degrees Celcius for the next year. It has been postulated that should the Yellowstone supervolcano erupt, it would exceed the last eruption, which ejected 240 cubic miles into the atmosphere. In the 28 days that pass before the denizens of the arks are permitted to go outside, the ash and debris from not only Yellowstone, but the scores of volcanoes that erupted almost simultaneously would have blocked the skies world wide. Not only would the citizens have been forbidden to emerge from their cocoons, but satellite views of Africa would have been impossible, and whatever crops survived the earthquakes and lava would have already started to perish.

As the heads of state decide to open the gates, we see the countdown timer in the background go from 14:40 remaining to 14:39. We cut to a different angle, and it's back up to 14:41.

At the beginning Scrooge is seen signing Jacob Marley's death certificate in the year 1836. English Birth, Marriage & Death certificates didn't come into being until 1837.

The movie takes place in 1987, but during the museum visit the main character is watching video from the Tiananmen Square uprising, which didn't occur until 1989.

Towards the end, Vince and his wife are by the waterfall (which I would like to comment is behind them; not sure what contractor would position the seats that way), he brings a six pack of Budweiser in a bottle. The problem is the island they are on has no stores to purchase this. You could argue that he got this from the bar, but a bar would purchase in bulk and thus would not have the little cardboard six pack holder.

During the "nude" scene on the beach, when Shane is asked to drop his drawers, he wears shorts initially, but then in a subsequent shot right before the "reveal", he is wearing pants.

When Katie goes downstairs in the scene at the end, the alarm light (green) is off. When she comes up with the blood on her shirt the alarm light is on.

When Katie wakes up and sleep walks outside, the alarm does not go off. This is weird because they set the alarm and say that it will go off if any doors or windows are opened. "Nothing comes in and nothing goes out".

The steak as seen through the X-ray machine is a T-bone, not a porterhouse.

When Shelton is eating his asparagus in jail and takes a bit off the top, a few seconds later after switching to another angle, he takes another bite and it still has the top of the asparagus on.