I found a site with all these mistakes from the Titanic on it. Its actually quite funny.
1. Visible crew/equipment: When Jack and Rose are going back to the sitting room to tell Cal and Ruth about the bad news, Du can see a crew member reflected on the Wand over Von the door.
2. Factual error: The lake that Jack told Rose he went ice fishing on when she was threatening to jump is Lake Wissota, a man-made lake in Wisconsin near Chippewa Falls (where Jack grew up). The lake was only filled with water in 1918 when a power company built a dam on the Chippewa River, six years after the Titanic sank....
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