Invader_Gir

Answer: I haven't seen this movie in a very long time. However, if I remember correctly, Adam was originally going to erase both Amy and Randy's memory to keep their identity a secret. The risk of them being exposed as superheroes would have been too great. It was only after Randy protested, upon seeing Amy getting her memory erased, where Scott's parents agreed it would be nice for him to have a friend to talk about his secret life with. Scott was more disappointed Amy's mind was erased because they had shared feelings for one another. He was afraid she would not remember her liking him. However, the parents accurately state, "if she liked you before, then she will still like you afterwards." This was evident when they chose one another to be co-captains. If they allowed Amy to keep her memory, it would have also prevented Scott from having any normal type of relationship with her.

Invader_Gir

Answer: It was in the script that they would die. Ronnie stated he knew it would end badly because the director gave him the full script ahead of time.

Invader_Gir

Answer: In an episode of Myth Busters, they checked to see if Jack could've actually fit on the board and survived. Their first result stated the the movie was correct; there was not enough buoyancy to keep them both afloat. After some thinking they decided to tie Rose's life jacket under the board to increase the amount of buoyancy, and sure enough the board did float, but it's not unreasonable that that wouldn't have occurred to Jack and Rose. When they consulted James Cameron about the results he simply stated, "I think you guys are missing the point here. The script says Jack died. He has to die. So maybe we screwed up and the board should have been a little tiny bit smaller, but the dude's goin' down."

Answer: Insider did an interesting article on this debate. The "door" Rose was floating on was actually a carved piece of wood paneling that hung above the first-class lounge. The evidence for this resides on display at the Maritime Museum of the Atlantic in Nova Scotia where an original panel of the ship served as the inspiration for the design of the wood seen in the movie. This is important because those panels were only made from teak, pine, and oak. Physics Central calculated the possibility of survival for all three based on buoyancy. They estimated teak would have been too heavy and would have sunk under its own weight. Pine may have supported their weight, but was ruled out when the panel flipped when Jack tried to grab it. The oak paneling seen was only strong [and large] enough to contain Rose as the weight of both Rose and Jack would have outweighed its buoyancy.

Invader_Gir

Answer: It would not short-circuit the system because Arthur's sacrifice would have completed the ritual, therefore giving Cyrus the power he desired. Unbeknownst to Arthur, Kalina was working with Cyrus when she lied to him about there being a fail-safe that would turn off the machine. She hoped it would convince him to sacrifice himself to prevent hell on Earth from becoming a reality. Cyrus did not believe it was enough and placed Arthur's kids in the center to ensure he would be willing to make the jump. However, Cyrus did not plan on Maggie being there to tinker with the controls of the machine. It was her actions that overloaded the machine, which allowed the ghosts to go free, and cause it to have a catastrophic meltdown as she pushed it beyond its limitations. It can be safe to assume if Maggie was not there, the machine would have never broken down.

Invader_Gir

Answer: Kalina had lied to Arthur about the thirteenth ghost being the failsafe that would shut down the machine. In actuality, if he had sacrificed himself and died, he would have completed the ritual and activate the device.

Answer: Rose does die at the end. She dies above the wreck of the Titanic and returns to the ship (metaphorically) with all those who perished on. I think she throws the necklace into the ocean because people should be interested in what happened and feel sorry for those who died rather than to look for treasures (my interpretation).

Kara

Answer: The ending is left ambiguous. After lying down in the bed she either, a) has one more dream of Jack or b) has died in her sleep and is now reunited with Jack.

Answer: According to director James Cameron, what happened to Old Rose is ambiguous so that people watching the movie can decide for themselves if she is still alive and having one more dream about Jack or if she had finally died and is now reunited with Jack. According to the actual screenplay, "We PAN OFF the last picture to Rose herself, warm in her bunk. A profile shot. She is very still. She could be sleeping, or maybe something else."