Continuity mistake: At the start the doors to the van are open in some shots and closed in others. Mainly noticeable when the driver spots the SWAT team. (00:04:50)
Continuity mistake: Alex is telling Annie to get on a lifeboat and is getting soaked. A minute later, when he enters the bridge, his suit is completely dry. (00:42:00)
Continuity mistake: When Alex realises Drew is in the ballast tanks by looking at the monitor, he says "f**k" before anyone can be seen on the screen. (00:59:20)
Suggested correction: I think your film may have been out of sync slightly as this doesn't happen on my copy?
Continuity mistake: The way Annie holds the grenade changes instantly between shots. (01:09:30)
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)
Continuity mistake: When Alex surfaces from under the ship, he chucks his mask off and it floats away. Once Geiger has forced Annie to drop Alex back into the water, he suddenly has the mask back. (01:21:00)
Continuity mistake: When Annie has been taken hostage near the end, Alex takes his white shirt off and throws it down. Next shot he has a dark blue shirt on. (01:22:00)
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)
Continuity mistake: When Geiger is setting off from the ship, in the background, the stern door is almost shut. Camera cuts to Alex on the stern door and it is nowhere near shut. (01:23:15)
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)
Revealing mistake: When Alex and Dante are heading for the bow thrusters, there is one shot of the Seabourne Legend cutting through the water. In one shot you can see the wake from the filming boat before where the Seabourne Legend has been. (01:27:00)
Revealing mistake: When Seaborn Legend hits the Eindhoven Lion, some of the sparks come from places that are not making contact. (01:30:00)
Continuity mistake: The Seaborn Legend hits the Eindhoven Lion and can be seen scraping off the end of the tanker. The shot then changes to Annie and the Seaborn Legend is a good distance away from the tanker. (01:30:20)
Revealing mistake: When we see Annie looking back at Seaborn Legend just after it hit the Heindhoven Lion, the Seaborn Legend looks like it is superimposed onto the water. (01:30:30)
Continuity mistake: Once the two huge ships have collided, they go off in opposite directions. Just as they notice that they are going into town, the one boat is at a completely different angle. (01:31:10)
Continuity mistake: After being underwater to deal with the bow thrusters, Alex and Dante go up to the bridge. When they get there both of their shirts are almost completely dry, despite being fully submerged in water only minutes before. (01:32:40)
Audio problem: When Alex orders that the second anchor be dropped, the 1st officer says "I'm telling you we're still too fast." However, his mouth doesn't move at all. (01:33:30)
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)
Other mistake: While the ship rips through the town, many buildings seems to get smashed. But in the shot from above not all the damaged buildings are visible. (01:41:10 - 01:45:00)
Other mistake: At the end when the plane hits the tanker, people shout "abandon ship" and next shot, a lifeboat full of people is halfway down the side of the ship. This would be impossible. (01:48:00)