The statement about beginnings of decades and centuries, is absolutely not correct. :-)
The movie starts with the celebration of the advent of the 20th century, which is supposed to start in 1900. In fact, decades and centuries start with 1, and end with 0: 1901-1910,1911-1920, 1921-1930, 1931-1940,1941-1950, 1951-1960, 1961-1970, 1971-1980, 1981-1990, and 1991 to 2000. 1900 is in fact the LAST YEAR of the 19th century.