One of the submersibles at the end is the Alvin, the sub that Bob Ballard first explored Titanic in, when he first discovered the ship in 1986.
Portions of the movie were filmed aboard the Queen Mary.
The scenes of the "Goliath" at sea are taken from Gentlemen Prefer Blondes. The model was first used in Titanic, and refurbished to resemble the Queen Mary.