The montage sequence depicting Edison's inventions lists "electric power transmission" over a shot of a massive transmission line and the tower that holds it up. That technology was in fact developed not by Thomas A. Edison but by Nikola Tesla. (Tesla held over 700 patents, including Radio. Guglielmo Marconi stole the radio patent from Tesla. The US Patent office has since revoked Marconi's claim, giving it to Tesla.) Edison insisted on powering his lights with direct current, which could only travel short distances from the generators that produced it. Tesla used alternating current, which could be run through transformers to increase its voltage so it could be moved over long distances, then reduced in voltage again for home use. Tesla's alternating current, not Edison's direct current, quickly became the standard and is what is used today.
Thomas A. Edison's hearing ability is played in the movie as being much better than it was in reality. See trivia.
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