Other mistake: When Captain Spaulding first arrives near the beginning at the movie, he takes his hat off twice.
Other mistake: Harold Lloyd, aboard a cruise ship, looks over the railing. There is a shot of two sharks swimming in the water and another shot of several men rowing a kayak. However, the ship is just starting to pull away from the dock and Harold is on the side of the boat overlooking the dock. There is no way he could have seen sharks and rowers.