On the kinetoscope , "We Secede From The So-called 'Union'", the quotation marks are incorrectly used in the film, using the double quote at the beginning, end, and before the word "Union". They are used correctly on the title on the outside.
Silent films with recorded music soundtracks are seen. This wasn't introduced until the mid 1920s.
An ice cream shop is selling Soft Serve, which was not invented until 1950s.
Radio news broadcasts are heard, and radios are also heard broadcasting music. Although radio broadcasts were feasible in the 1910s, neither of these innovations really became widespread until the 1920s, with the first radio news broadcasts not happening until 1920.
Elizabeth uses the term "Flak Cannon" to point out soldiers with volley guns. The German word "Flak" did not enter the English vocabulary until the late 1930s.
Weapons such as sub-machine guns,Rocket-propelled grenades or multi-chamber grenade launchers were not available in 1912. Submachine guns were designed after 1914, rocket-propelled grenades were introduced in World War II and multi-chamber grenade launchers were designed in mid 1980s.