When Sofia comes home and encounters Andrea, his serious head wound is very prominent, and she inquires about his well-being. The next time that they meet--presumably within a few weeks of their previous encounter, based on other events depicted--there is no evidence of his wound whatsoever.
RMS Olympic, Titanic's sister ship, is shown to have been damaged on her port side at the bow after the collision with HMS Hawke. Actually, it was her aft starboard side the one breached by the collision.