The movie suggested that Carl Michael Ziehrer started foreign tours with this orchestra after he left his position as a military band leader of the infantry regiment "Hoch- und Deutschmeister Nr. 4". In real life during his position from 1885-1893 he was also touring around Europe.
The movie suggests that Ziehner's first conducting job was conducting Johann Strauss "Stories from the Vienna Forest". The waltz premiered in 1868 but Ziehner first conducted in the Dianabad halls in 1863.
Marianne Edelmann, who in the movie was called Mitzi Munk, was actually called Maria Laura Münk (with umlauts), whom Ziehrer married in Berlin in 1888. In the movie they married in Vienna in 1880.
There was never a World Fair in Oslo/Kristiania and there was never one in 1880, as suggested in the movie.
The first newspaper article mentioned Carl Michale Ziehrer as a "former military bandleader", which would set the scene at 1893, while the next article mentioned an exchange market crash, which would refer to the crash panic of 1873 in Vienna.
The title giving waltz "The Girls of Viena, op. 388" was written in 1888, the movie scene however is set in the 1860s.
Ziehrer's march "The Magic of Montur, op. 493" was released in 1899, in the movie it is played by a marching band in the late 1860s.
At his first performance Carl Michael Ziehner conducts his waltz "Citizens of Vienna, op. 419", a piece that was released in 1890. Carl Haslinger who appeared in the same scene died in 1868.
The "Baron von Schönfeld-March, op. 422" was released in 1890, in the movie however it was played by a marching band in the late 1860s.
When announcing the world exhibition in Oslo the word "Verdensudstilling" appears, which is "Wordl Exhibition" in Danish, not in Norvegian. The Norvegian would have been spelled "Verdensutstilling"