When the deaf girl enters the elevator, there is nearly 8 minutes on the timer until the engine room shutdown. Then, nearly 2 minutes after the explosion, the elevator stops. The likelihood that anyone would be in an elevator on a ship this size for 10 consecutive minutes is unrealistic.
Before the collision with the Eindhoven Lion, The Seabourn Legend sails towards the Coast, but right after the collision with The Eindhoven Lion, The Seabourn Legend turns 90 degrees and it's facing towards open sea. But later, the ship is still sailing towards the coast.
Annie goes to the bathroom to change into a swimsuit. Just after Alex opens the case the ring is in, Annie is in the background with her sarong wrapped around her and already tied up. In the next shot, she can be seen in the mirror just beginning to put the sarong around her.
Early in the movie, when the SWAT officer (male lead) is chasing a delivery van by motorcycle, the rear door of the van flies open and boxes fall onto the road, making the officer swerve repeatedly to avoid a crash. At one point, the van is clearly empty of all remaining boxes, but in the next shot, more are stacked and about to fall out.
Bow thrusters are primarily used to maneuver a ship away from a dock. Run for several minutes, they could typically rotate a ship by a few degrees. There is no way they could perform the violent turn to avoid the supertanker in the film. Also, bow thruster tubes normally have operable doors on either side to cover the propellers while the ship is moving. This protects the bow thrusters which can be broken if exposed while the ship is traveling at high speed.
At one time in the movie, a person falls over board, he is sucked down under the ship and into the propeller. A ship moving at it's most efficient cruise speed, creates very little, if any, suction near and on the surface, due to a low amount propeller slip.
You cannot walk into a ballast tank from the accommodation areas. The tanks are not painted white on the inside, and electric lights are not installed in ballast tanks. And finally, when filling ballast tanks, it is done through a pipe and a pump, not by opening gigantic doors in the ship's hull.
While crashing into the dock, the ship decelerates from 6 knots to 5 knots in about 20 seconds. This is apparently enough to throw people forward through the ship's windows, yet in reality this deceleration force would barely be noticeable.
When the Staff Captain signals the 7 short and one long blast on the bridge, this is called the "General Alarm". Passengers proceed to their lifeboat stations and attendance is taken. Only on a single continuous sounding of the ship's alarm bells and whistles followed by an order to abandon shop would lifeboats be launched.
In several scenes, many passengers are stuck behind "fire screen doors" and unable to get out. These doors open like any normal doors with the recessed handle built right into them. You can see this handle when the chainsaw is used. Even if the passengers were somehow stuck behind water-tight doors, those can always be opened via a manual crank.
When the ship finally comes to a stop, the dog jumps into the convertible. In the next shot, the jammed anchor on the ship falls into the car and the car is crushed. The dog would have been killed too. But, the dog comes out of the car unharmed.
After Geiger destroys one of the ship's engines (which consequently disables the starboard propeller), the ship is still able to maintain 17-18 knots cruising speed regardless of the fact that only half of the ships potential thrust is being produced by the single propeller.
When Gieger repeatedly swings the lamp towards the captain, the captain continues to move along the wall towards him. Once Gieger's threatening intentions were made clear to the captain, it would have made more sense for him to back AWAY from Gieger when given the opportunity.
Fire doors aboard modern liners are made of maritime steel, a hardened metal sometimes 2 inches thick and covered with flame retardant paint. There is no way a regular chainsaw could cut through them, much less as easily as shown in the movie.
The "control room" for the bow thrusters is almost flooded. Yet, when hit by the anchor of the supertanker, we can see it is way above the waterline. By basic physics, it is impossible for any compartment of the ship to be that flooded and at the same time that high on the ship.