^ In the French original, some characters were named a little differently: Gédéon Spillet, Nabuchodonosor (Nab) and Harbert Brown. In the Kingston translation, the engineer is named Cyrus Harding, and the sailor is named Pencroft.
^ There are discrepancies in continuity between this novel and Twenty Thousand Leagues Under the Sea. Although this novel was written in 1874, its events take place from 1865 to 1869. The events of Twenty Thousand Leagues Under the Sea take place between 1867 and 1868. For example, the Captain Nemo appearing in this novel dies at a time when the Captain Nemo in Twenty Thousand Leagues Under the Sea was still alive. There is usually a note in most editions of the book admitting date discrepancies. There are also similar discrepancies with In Search of the Castaways, although, these are not as often pointed out.