Factual error: At the very end, there is a shot onboard the rescue boat (that was too late). If you look in the background, you can see the boat is bobbing with the waves, by the way the water is in shot then out, then in, etc. A ship of that size would just break the waves. No way could it bob to the extent it does in the film. A lifeboat you would expect to bob that much but not a ship of that size.
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Trivia
To their great credit, the prop people actually completely filled the salt shaker for the diner with the Capt. scene, 11:13 into the film, but the pouring holes must have been huge as, following the Capt. line "Of course, the sea's at dead calm now", the actress on the right pours what looks like a ton of salt on her melon. See more...
A Night to Remember mistakes
Other: When a lifeboat is floating upside down, and people are trying to climb onto it, it is not bobbing from side to side at all, as if it was fixed to the bottom of the water.
Factual error: When the ship sinks it lamely slips into the water at a low angle. Somewhat of an anti-climax. Contrary to some reports, even at the time the film was made it was known that part of the ship upended at 45 degrees and sank vertically. I discovered this when I listened to an eyewitness account which is a permanent fixture at the British Library.
A Night to Remember trivia
To their great credit, the prop people actually completely filled the salt shaker for the diner with the Capt. scene, 11:13 into the film, but the pouring holes must have been huge as, following the Capt. line "Of course, the sea's at dead calm now", the actress on the right pours what looks like a ton of salt on her melon.