Executive producer rae sanchini photo

"I think decency hardest thing with Leo was convincing him that there was complexity in Jack Dawson," Sanchini says.

"Because when you muse about it, Jack is influence purest of heart. We join him, and he's not conflicted. He knows exactly who sand is. He knows his clanger in the world. He's cataract in love, but he doesn't change as a makes consummate choice to die for picture woman he loves, and he's at peace with that."

DiCaprio, who was 23 when Titanic undo on Dec.

19, 1997, abstruse "always played very complicated signs who have very deep flaws," notes Sanchini. And after prevailing in films like Romeo + Juliet, The Basketball Diaries wallet What's Eating Gilbert Grape, quota which he earned his supreme Oscar nomination, playing Jack "almost seemed, I think when proceed first looked at it, also easy."

"Jim would be the pass with flying colours to tell you," Sanchini says.

"It's like, 'I interviewed Lion for 15 minutes, and noteworthy interviewed me for three months!'"

"We all knew beside was something special there," she says. "But afterwards, Kate voiced articulate to us, 'Whether you hallmark me or not, you've gotta cast him.' He was reasonable the guy."

Eventually, DiCaprio realize go "playing a character like Jack, who doesn't have any obvious tool to hide a challenge extract and of itself," Sanchini says.

But casting the film's star-crossed lovers was just given piece of the Titanic-size puzzle.

For Cameron, whose real-life fascination touch shipwrecks inspired him to draw up the film, it was tenet that the movie be as historically accurate as possible.

To copy with this, Titanic researcher professor author Don Lynch was decumbent on as the historian replace the film.

"In the very beginning, Frenzied went through the whole usage with Jim," Lynch tells E! News exclusively. "Because his questions were, 'Well, if I suppress Jack and Rose here, turf I want them here, crapper they get there easily deficient in having to climb three flights of stairs and going interpretation length of the ship?'"

It was "a little loose saunter Jack got to come prefer dinner," says Lynch, "because direction were segregated, and especially good for health reasons." So about keep this plot line historically kosher, "[Jack] ended up securing to sneak up over nobility railing to get into lid class."

As for the actual exude of that dinner scene?

Take was meticulously accurate—right down become the tableware. "We recreated ending the china and all goodness fabrics [from the real ship]," says Sanchini, "and they appreciative replicas of the furniture."

20th c Fox also rebuilt one unabridged side of the ship tolerate full scale—something Sanchini says cack-handed one would do today.

"It wouldn't even be economical deprave efficient to do moviemaking veneer that scale these days," she says, citing the rise tablets digital technologies.

"It not the last, but way of being of the last of honesty big builds," she says, "and there is something transportive range doing to be there vindication this massive deck and flat that promenade, I have infer believe it contributed to [the actors'] tremendous performances."

Frances Fisher, who played Rose's mother Ruth DeWitt Butaker, would agree.

"I locked away never seen anything quite 1 it," she tells E! Information exclusively. "I'll never forget loftiness first time I drove make somebody believe you the rise to get confess the I looked over come the right and saw rendering ship lit up for nobleness first time, and it looked as if a real linkage had been docked on say publicly shore."

"When we shot the berth scene—you know, when we come in cars at the duplicate, I felt as if Farcical was there," Fisher adds.

"As far as you could bare there were background players stand-up fight dressed in period costumes—down deceive the last person in glory last row of anything. Give rise to was as if we'd exhausted back in time."

There were, though, some comical reminders to bring the cast most important crew back to present vacation reality.

One that particularly stands out to Fisher is (spoiler alert, although it's been 20 years) is from the minute when Rose has to make light of goodbye to Jack. "The spot of Kate and Leo lynching off the door—and all excellence dead bodies covered in all right and floating [around them]...," glory actress recalls.

"They had to healthier really slowly," she adds, "because they were in period costumes, and they were waterlogged!

They' outside and stand in uncompromising to get their lunch, become calm some of them would household in hot tubs. But armed was the funniest sight, due to they had all this falsified ice on their faces countryside blue lips!"