This footage is actually of her sister ship the R.M.S. Olympic which Captain Smith also commanded before the Titanic. The reason for some of the film scratches was so the news people at the time could hide the fact it was not Titanic while trying to sell the footage. The tugs for instance would be identifiable as New York tugs, which Titanic of course never reached. That said both ships were almost completely identical and this news footage is a fantastic artefact of the time.