Rose: Half the people on this ship are going to die.
Cal Hockley: Not the better half.
When the men are checking the store room for Rose and Jack, the men are using huge battery powered bright white flash lights that look like they're from Jurassic Park, which were not around in 1912. Back then they would have produced yellow light.
When Jack Dawson says, "Sit on the bed....I mean the couch," it says in the script "Sit on the couch." Leonardo DiCaprio (who played Jack) really made that mistake.