The motion of the ship below deck is unrealistic. At 0:32:00 and 1:50:00 the scene inside the cabin shows rocking along one axis only - side to side - when the ship was in a storm. Anyone with practical experience with boats and ships in the rough weather depicted would expect pitching fore and aft as well, and violent crashes from bashing into waves, creating a corkscrewing roll that contributes so much to seasickness. Also at 1:50:00 an exterior shot of the ship in the storm is accompanied by a command "reef the mizzen mast" but the sails are hanging limply; the heavy roar of the wind suggests they could not be in the eye of the storm.
Mrs. Allworthy puts lip rouge and a beauty mark on Moll. Moll wipes off the lip rouge walking down the stairs but not the beauty mark. When we next see her face, the beauty mark is gone.