Saving first class passengers before second and third class may be disturbing to some.
The final scene is very fairly intense but the extras are not very good at acting so you will mostly likely chuckle instead of feeling sad.
The final scene is very intense considering the year the film was made.
The most intense scenes include a couple being crushed by a falling funnel and a few people seen either freezing to death or drowning. A child is brought out of the water dead (though most of the scene is obscured). Most other scenes are psychological.
Really, what hits home is knowing that this is a true story and realising that many people including children died that night.