When you are recording (in either manual or automatic mode) and you perform a drag-and-drop operation, Captivate creates a special Full Motion Recording (FMR) slide. This slide has a small black camcorder icon (I actually think it looks more like a bugle!) beneath it in the resulting Filmstrip. Instead of a static screenshot, its background is an animation that shows the drag-and-drop action.
In Captivate 5.x, you may notice some rather strange things happening to the mouse position and movement within the two slides that precede and follow the FMR slide: