Other mistake: When the Cuban ship approaches, the guy on the Albatras ship starts speaking Spanish using a megaphone. They cut to the Cuban guy, and then cut back to the guy on the Albatras speaking Spanish, and although you hear his voice sounding like its coming through the megaphone, there is NO megaphone to be seen.
Factual error: As the students disembark from their DC-3 at the airport a Britten-Norman Islander is seen in the background, an aircraft type that did not enter production until five years later. A little later what is clearly a post-1970 Land Rover is visible.
Continuity mistake: When the survivors of the sunken ship are floating in the life raft, Geig makes a comment while observing the cloudless night sky: "look, there goes Shepherd..."(something to that effect, in reference to the recent launch of Allen Shepherd in the first Mercury manned-space flight). In actuality, Shepherd's flight was a day launch and a sub-orbital flight lasting only few minutes. He never achieved orbit and therefore would not be visible travelling in the night sky.