Continuity mistake: When Annie is being taken hostage at the end, Alex jumps down onto the stern door but misses and lands in the water. He is then shown hanging onto the stern door's edge. Since the edge is about 10 feet over the water's surface, he must be a pretty good athlete to jump and grab hold of it. (01:23:10)
Other mistake: Alex jumps from the deck to the stern and falls into the sea. The ship moves at a speed of about 15 knots, and there is no chance that in a few seconds Alex could climb back to the ship, because he would be at least 50 feet away. (01:26:55)
Continuity mistake: On the bridge the speed is shown going down fairly fast. The camera shows it going down from 17.8kts to 17.3kts. Geiger is then made aware of the deceleration and opens up his PC. The speed is still decreasing but is only at 17.1kts when he first looks. The speed is still going down at the same rate so should be well past 17.1kts on Geiger's screen. (01:18:00)
Factual error: The "Seabourn Legend" makes 19 knots at full sea speed. After Geiger fails one of the engines she still makes 18 knots while headed for the "Eindhoven Lion." With only one screw active and one engine out of order, that wouldn't be possible.
Visible crew/equipment: When the Seaborn Legend is just starting to hit the decking, there is one shot from on the deck of the boat moving towards the camera with a cannon in front of the boat. Look by the end of the cannon and you can see the camera that is attached to the boat. (01:37:00)
Continuity mistake: When the cruise liner is heading towards the oil tanker, her speed is 17kts. When the oil taker is monitoring the cruise ship, the speed it's doing is 14kts. Alex's attempt to slow the cruise ship down failed so that won't explain the difference. (01:18:00 - 01:21:00)