After the final boat chase scene, the boat that Cage and Travolta are on "flips" into the air and explodes. First of all, the people flying through the air are obviously stunt doubles - they look nothing like Cage or Travolta. The cabled boat slip-up can be seen after the camera zooms away from the doubles to show the boat exploding. Look at the top center of the screen to see a cable swaying from the explosion. Apparently, this was holding the boat in a vertical position for the explosion. Easily seen at normal speed.