Rose: You have a gift, Jack. You do. You see people.
Jack: I see YOU.
Jack: You wouldn't have jumped.
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. Back then they would have produced yellow light. The light used in the movie was a Short-Arc Xenon bulb, you can tell this by both the very high color temperature of the light and the center of the light has a "hole" in it where the actual tube is blocking the beam. Such technology was not around at that time.
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.