Continuity mistake: The adventurers are met by a ship with a single sail that has a triangular symbol on it. When they first see the ship the sail is unfurled and shortly afterwards it is unfurled again.
Other mistake: In the opening credits the following is posted "Screenplay based on Rider Haggard's Allan Quartermain" The author's name is usually given as H. Rider Haggard (H. For Henry), and Haggard's hero was named Quatermain (1 "r" not 2). This misspelling of Quatermain appears in many movies.
