Corrected entry: When they are all huddled in the propeller shaft room, the rescue crew burns through the hull with a cutting torch. With the ship being upside-down, the pressure inside the hull would be tremendous. Not only that, when the first cut was made in the hull, the air would rush out and the water would quickly fill from the bottom seeing as they never shut a watertight hatch behind them.
Corrected entry: Just after the underwater swim to the engine room, when Nonnie is being brought out of the water, you can see her using hidden, submerged steps of some sort on her way out.
Corrected entry: In the scene where the boat is tipping over and they are falling the tables stay on the "ceiling" and also the chairs. The tables might have been bolted down, but surely the chair need freedom of movement?
Corrected entry: The boat turns turtle just a few minutes past midnight. We trek with the surviviors every step of the way and there is no point reflecting passage of unseen time, yet nintey minutes later when they emerge from the hull, the day is shining bright...