Many of the technologies and tactics of the Civil War were developed during the Crimean War-- rifled musket use, iron ships, communications, etc.
Baseball as an organized team game with paying fans was well established prior to the Civil War, as the advertisements and scores in local newspapers of 1860 prove.
Many technologies in use during the Civil War are forgotten. Electric signal lamps, high powered spot lights, new medicines, colored flares for signals, industrial and home sewing machines, and many other examples were in use.
I agree with Joe on the death count and causes.