The setting of this film is 1837 and Queen Victoria's look includes a small crown, however in real-life she didn't use it until 1870, after the death of her husband, Prince Albert of Saxe-Coburg and Gotha. The small crown was created so she could dress as a widow.
During the opening credits sequence, a modern political division of America is shown, however in 1837 some of the states shown (California, Arizona, New Mexico, etc.) were part of Mexico yet, even California, Arizona, Nevada, Utah, Colorado, and Wyoming were a sole state called Alta California.
When Black Bellamy arrives at Blood Island in the whale, Pirate Captain and Pirate With A Scarf walk to the hole in the wall and witness the whale jump from the sea. There is no table behind them, but when the whale bumps into the building, a table and occupant have appeared for its mouth to drop open on.
As in many paintings of sails ships, here in animated movie, the wind blows from the back to fill and push the sails and the ship forth, but wrongly the flag points back as if the ship advances against the wind. Aesthetic but inaccurate goof often existing even on some classic paintings..