Factual error: Jack Sparrow says he loves the French because "they invented mayonnaise." The film is set in the 1750s. The egg-based sauce known as mayonnaise was developed in the early 1800s. The Oxford English Dictionary says the word dates from 1815.
Factual error: The governor of the island claimed the bank safe (roughly 2 meters square on a side and with walls about 13 cm thick) weighed "an imperial ton." A safe of this size would weigh nearly 22.5 imperial tons.
Factual error: The British Ship of the Line is flying a version of the British Union Jack that was not adopted until 1801. The story is supposed to take place between 1720 and 1750.
Answer: It would have been considered "risque" to see a woman's ankles. Well-bred, modest ladies always wore clothing that covered most of their bodies.
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