The first time Loxi talks to Jack, her hat ribbon repeatedly changes position around her neck, between shots.
The second time Loxi talks to Jack, she points at him with the index finger of her left hand. In the next shot it is her right hand.
The song "'Tis But A Little Faded Flower", was published in 1860, but sung in the film, which is set in the 1840s.
Hinge lines can be seen in the arms of the squid on two occasions (1:50.30 and 1:52.06).
As Steve throws Loxi over the rail of the boat after interrupting the wedding of her and Jack, you can tell the body is a dummy as he throws her over as the head/body hits the boat before falling in the water.
Incorrectly regarded as a goof: John Wayne's reference to Mother Carey's Chickens has nothing to do with Kate Douglas Wiggins 1911 novel. It is a seafaring name for the Storm Petrel, so-called because the birds appear before a storm. Mother Carey is a corruption of Mater Cara (Dear Mother), an epithet of the Virgin Mary, to whom Portuguese and Spanish sailors used to pray before a storm.
Jack makes a reference to "Mother Carey's Chickens", although the movie is set in the 1840s and Kate Douglas Wiggin's novel wasn't published until 1911.
The character Salt Meat is introduced as a Barbados sailor, but he speaks with an American Southern accent.