#1 Problem: Didn't Ford Pintos of the 1970s explode after being rear-ended? Also, if the gasoline tank in a car is 7% full, then the other 93% is... air. Boom!
#6 Problem: Ok, not a problem, but an inaccuracy. Middle C is 440 Hz, not 256 as you stated. Also, I think most people realize that sound oscillations will change with the speed of the video. But, time compression and expansion is added for artistic effect. The most prominent example that comes to mind is Forrest Gump -- "RRRRrrrruuuuunnnnnnnn FFFFfffffooooorrrreeeeeessssssst!" The little girls's voice wouldn't have the same emotional impact if she sounded like Andre the Giant.
#6 Problem: Ok, not a problem, but an inaccuracy. Middle C is 440 Hz, not 256 as you stated. Also, I think most people realize that sound oscillations will change with the speed of the video. But, time compression and expansion is added for artistic effect. The most prominent example that comes to mind is Forrest Gump -- "RRRRrrrruuuuunnnnnnnn FFFFfffffooooorrrreeeeeessssssst!" The little girls's voice wouldn't have the same emotional impact if she sounded like Andre the Giant.