Incorrect Date
Let’s go back to the drawing-Rose-nude scene because we’re pretty sure that’s a fan favorite. The vanishing line on the sketch pad wasn’t the only error Jack made. When he’s done with the drawing and shows it to Rose, he clearly dates the drawing as April 1914.
As we’ve repeatedly mentioned indirectly throughout this piece, the Titanic sank in 1912. So, this pretty much confirms that Jack is a time traveler. However, it still doesn’t answer how he and Rose have knowledge about things that took place decades later. Not only is he a time traveler, but he’s a fortune teller, too!