Plot holes: Challenger gives Summerlee a note with "directions" on it to The Lost World. He then shows up at 12:00 when the expedition is supposed to start. How would Challenger guarantee himself that he would show up exactly at that time? Plus, if he did it would mean that he would have to be on the same boat, which he wasn't. He couldn't have been on a different boat and left at the same time for the same place either. That is a waste of resources and a transportation company would not do it.
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