There are 'ghosts' all over the photo, proving that some of the living beings were moving faster than the camera's exposure setting. There are two separate 'ghosts' working on the lifeboat in the near foreground (the angle of their feet are different, so one is not a reflection of the other), and another couple of more-opaque 'ghosts' standing at the base of the after funnel.
I had to wait and view the photograph before I could post on this, because there are other examples were people have been crudely removed from photographs of Olympic/Titanic, leaving behind a ghostly image. A good example of this is on page 84 of McCaughan's "The Birth of the Titanic."
Parks