I think I caught one related goof in the movie. (It took some effort. In terms of historical accuracy it's a terrific flick.)
My understanding is that in the eighteenth and early nineteenth centuries, helm orders were the reverse of what they are today. The standard system for giving helm orders was keyed to the movement of the tiller. When you swing the business end of a tiller to the left, the vessel's head turns right - and vice-versa. In sailing ship days - and, I believe, right into the twentieth century - sailors used that system regardless of whether the ship was actually steered with a tiller or a wheel.
When Russell Crowe says "Hard astarboard," the ship moves to starboard. If he wants it to do that, he should be saying "Hard a larboard."
If I remember correctly (the usual caveat: I may not) the old system was still in use in 1912, and caused some confusion in the hearings over the loss of the Titanic. The first officer apparently said "hard astarboard" when the iceberg was spotted, with the result that - quite correctly - the ship turned to port.
A few years later (I don't remember the date) the profession agreed to start using the words "right" and "left" in helm orders. I think I have all this straight; maybe a Navy veteran can correct me.
I'm reminded of a funny flub in another of my favorite movies, "Das Boot." In one of the early scenes, as the U-boat is on its way out of France and about to submerge for the first time, the captain is on the bridge making some profound remarks to the war correspondent. The captain then turns around to leave the bridge and barges straight into the navigator, who's right in the middle of taking his noon sight with his sextant. The scene then ends abruptly. Danke schon, Herr Kaleun.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.