can you point out some of the errors in the movie

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 In the scene where Jack comes to the first class door for the first time in his tux you can see a cameraman in the glass door before he enters. You can view more here, and not to mention errors from other films: http://www.moviemistakes.com/film1299

I noticed a few. First when the ship was going down and you see the man who is holding on to the flagpole his life jacket disappers then reappers a couple times. Another is when Rose spies the ax and breaks the glss to get it the next camera angle shows almost all of the glss intact.