The whole end of the movie when they are searching for survivors in the water...well..I hate to break it to ya..But there were no flashlights back than.
I can't remember the film cos it been so long since I last saw it but did anybody actually refer to them as flashlights? The crew were all from Britain (most from Southampton but quite a lot were Irish) and in Britain flashlights are called torches. If they did refer tot hem as flashlights, this would have been a slipup in the Script/Writers dept.
I've notice a different slip up... The flashlights used by the men searching for Jack and Rose are different from the man in the life boat's flashlight. The two men's had big boxes on them for batteries and the crewman in the life boat's was like a policeman's today. Did they have batteries that small in 1912?