Besides the 3D conversion, James Cameron made just one edit to Titanic prior to its re-release commemorating the 100th anniversary on April 15 of the ship's sinking.
Astrophysicist Neil deGrasse Tyson "sent me quite a snarky email saying that, at that time of year, in that position in the Atlantic in 1912, when Rose is lying on the piece of driftwood and staring up at the stars, that is not the star field she would have seen," Cameron said. "So I said 'All right, send me the right stars for that exact time and I'll put it in the movie.'"