12 Things You Didn’t Know About the Titanic

April 15, 2012 marks the 100th anniversary of the sinking of the RMS Titanic. Here are 12 things you may not know about the luxury ship, which sank on its maiden voyage from Southampton England to the United States.

Before Peeta and Katniss broke box-office records, before Edward and Bella set tween hearts swooning, there was Jack and Rose.

Fifteen years ago, the youthful star-crossed lovers in 1997′s Titanic – played by Leonardo DiCaprio and Kate Winslet – helped propel James Cameron’s epic blockbuster into box-office history. The film earned $1.8 billion worldwide and scored 11 Oscars.

Now Titanic is sailing back into theaters on April 4, this time in 3D. To mark the re-release, which is taking place along with the 100th anniversary of the real sea disaster, PEOPLE spoke with Winslet and Cameron about their memories of the film – including a few surprises:

12 Things You Didn’t Know About The Movie “Titanic”

1 of 12 Things You Didn’t Know About the Titanic: The studios wanted Matthew McConaughey to play Jack, but James Cameron insisted on Leonardo DiCaprio.

2 of 12 Things You Didn’t Know About the Titanic :Gloria Stuart was the only person who worked in the production of the film who was actually living in 1912.

3 of 12 Things You Didn’t Know About the Titanic : On the set of Titanic, Leonardo DiCaprio’s pet lizard was run over by a truck, but with some TLC, Leo nursed him to health.

4 of 12 Things You Didn’t Know About the Titanic : On the final night of shooting in Nova Scotia, one or more pranksters mixed PCP (angel dust) into the clam chowder served to the cast and crew. 80 people were taken ill, many hospitalized with hallucinations.

5 of 12 Things You Didn’t Know About the Titanic : Reba McEntire was offered and had accepted the role of Molly Brown, but due to later schedule conflicts, had to turn it down.

6 of 12 Things You Didn’t Know About the Titanic : Kate Winslet was one of the few actors who didn’t want to wear a wetsuit during the water scenes; as a result, she got pneumonia.

7 of 12 Things You Didn’t Know About the Titanic : The cost to construct the ship in 1910-1912 was $7.5 million which was about $120 to $150 million in 1997 dollars. The movie cost $200 million to make.

8 of 12 Things You Didn’t Know About the Titanic : Titanic was the first film to be released on video while it was still being shown in theaters.

9 of 12 Things You Didn’t Know About the Titanic : Rose, in her old age, owns a Pomeranian. A Pomeranian was one of only three dogs known to have survived the disaster.

10 of 12 Things You Didn’t Know About the Titanic : James Cameron originally wanted Enya to compose the score for the film and even went so far as to assemble a rough edit using her music. When Enya declined, Cameron hired James Horner.

11 of 12 Things You Didn’t Know About the Titanic : James Cameron drew all the pictures in Jack’s sketchbook. In fact, the hands seen sketching Rose wearing the necklace are not Jack’s but Cameron’s.

12 of 12 Things You Didn’t Know About the Titanic :The coat Rose wore when the ship was sinking was a size 8 while the rest of the gowns were a size 4. It was so large to make Rose seem more vulnerable in the sinking scenes.