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Originally Posted by Rock Steady
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To me, not having the final comma makes it look like the last two elements are a part of a whole. A more illustrative example of this might be something like: "An airplane, a spaceship, cars, and trucks." To write it "an airplane, a spaceship, cars and trucks" sets cars and trucks as a part of a whole i.e. cars and trucks as land-roving vehicles.
I don't think I'm explaining myself very well, but I do remember being taught to put the comma before the 'and' in a list.