Factual error: Loosely based on the novel by Jules Verne, the entire story takes place on a remote Pacific island in the early 1860s. However, as pirates come under attack by a sea monster (in the second half of this two-part film), a modern fishing trawler or tugboat appears momentarily on the far right of the screen. (00:59:05)
Factual error: The DC shore based radio operator mistakenly tells the last known coordinates of SS Poseidon as 28° East longitude and 80° from Greenwich. That is nonsense because both mean longitude. Even though it can be assumed that what she really mean is Latitude: 28 degrees South and Longitude: 80° East from Greenwich, that is still not enough to specify the ship's position as the margin of error is about 400km. (01:25:20)