The producers of the film made painstaking effort to ensure that authentic late classical-era pianos were used on set, yet the music that is allegedly coming out of them is unmistakably from a 20th-century instrument.
Beethoven plays Für Elise for his nephew Karl, with his arms reaching around Karl's body, whilst Karl sits at the piano. There is no way Beethoven can reach the sustain pedal in this position, yet the piece is being correctly pedaled as we hear it played. Carl is not proficient enough to pedal for himself, let alone for another player, so it is not even an issue as to whether he may have been pedaling - he was not.
Early in the movie, after her bath, she says, "We were invited to Prince Vichnoski's palace, for a musical evening. Beethoven was going to be there." In the following shot, as the horses are approaching the palace, the shadow of the film crew is visible on the horses.
At his first public recital, Ludwig was eight years-old (some sources report seven) and his father announced him as six, yet the movie conveys, via voiceover, that Ludwig was "12 and his father told the court he was nine".
The grave shown at the end of the movie is neither Beethoven's grave as it was in 1827 at Währing cemetery nor is it the 1888 one, when his remains were moved to Zentralfriedhof. It is similar but it is missing the harp golden emblem on the middle of the obelisk, near the top, a serpent emblem of eternity, enclosing a butterfly.