Forgot My Lifejacket!
In one of the final scenes, there’s a background extra holding onto a pole for dear life. At first, he has nothing on but a jacket, trousers, and a hat that was appropriate for the time. But nobody was paying attention to the guy, not when Jack and Rose were on screen to steal the show.
But if you look closely in the next shot, you’ll notice that the man suddenly has a lifejacket on. Where did it come from? Were people tossing lifejackets into the air during their panic? That sounds like a totally reasonable thing to do: save those hanging on poles, not yourself.