Factual error: In the begining at the bridge ceremony, the band plays Manhattan Beach by John Philip Sousa. However, Manhattan Beach was composed in 1893. (00:00:50)
Factual error: It's not just the date of La Boheme they have wrong. Pirates of Penzance didn't premiere until 1880 and it was the apprentice who found love with the Major General's daughter and not, as stated, the Pirate King. (00:33:00)
Factual error: Leopold recognizes the telephone as the "talking telegraph" he saw at a fair "last year" in the scene where Stuart calls home from the hospital. The first public showing of the telephone was at Philadelphia Centennial Exposition which opened in May of 1876. (He is from April of 1876.) That aside, if he saw a talking telegraph in 1875, it would've been quite a feat because inventor Alexander Bell submitted his patent in 1876. (00:30:15)
Factual error: Otis elevator is called that because Elisha Otis invented the modern elevator in 1859, 17 years before the movie takes place. It had nothing to do with the Duke of Albany.