Corrected entry: As second officer Lightoller prepares to go off-watch on that ill-fated night, he is referred to as "Lieutenant". The rankings of the officers on a commercial vessel are, captain, first (or chief) officer, second officer, etc.
Corrected entry: In the film, the crew are unable to contact the Californian (the ship on the horizon) because it doesn't have radio. In fact, the Californian did have radio, it just happened to have been turned off.
Corrected entry: 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.
Corrected entry: It has been established that the ocean was unusually calm the night of the collision, one of the reasons the iceberg was not seen earlier, yet the scenes of the Carpathia show her ploughing through some serious swells.
Corrected entry: As the ship is about to take its final plunge, a small group of Irish steerage passengers is seen desperately clambering up the rising deck towards the stern. They include the young man seen singing in the third class saloon earlier in the film. Shortly afterwards they are shown again, still on board and awaiting the inevitable. One minute later they have all been miraculously transferred to a lifeboat, in time to witness the ship's passing. As the "Titanic" slips beneath the sea, the aforesaid singer begins reciting the Lord's Prayer. (01:40:00)