O'Brien's money (SPOILERS)
Didn't O'Brien (Stuart Whitman) jump off the crashed plane with a suitcase full of cash? I ask because nothing is explained about this anywhere in the movie. But later on, when the Stanley Baker character has him imprisoned in the pit, O'Brien offers to pay him to set him free -- obviously a reference to the money he has stashed.
Yet this is the only other reference to this cash...and since Whitman seems to be in a big hurry to catch the plane at the beginning, and risks his life to get the suitcase of money out of the plane when it's about to explode, something must have been going on. Has he robbed someone? And why isn't anything more made of this aspect? It seems like a plot point that deserved much more exposition and about which a lot more could have been made.