Corrected entry: Amadeus and Stanzi had six children, only two of whom would reach adulthood. We only see one child, a son, throughout the movie.
Corrected entry: Many mistakes occur at the time close to Mozart's death. Salieri was not the person who helped Mozart complete the Requiem. That was Sussmayr. In Amadeus, Mozart died with open eyes. In real life, Mozart passed out a few hours before he died, so his eyes should have been closed. And finally, Constanze was not at Mozart's funeral as depicted in Amadeus, but she got sick as well and couldn't go.
Corrected entry: In his asylum cell, Salieri plays a phrase from 'Eine Kleine 'Nachtmusik', which the priest readily identifies. This piece was hardly known until revived in the 20th century, and has since become elevator music. The ordinary music lover of the period may have recognised Mozart's opera melodies, but not his symphonic or chamber music, because public concerts did not then exist.
Corrected entry: When Mozart performs his piano (clavier) concerto outdoors, we hear a passage for the horns, but the director shows a close up of the bassoons.
Corrected entry: In the scene where Salieri assists Mozart with his requiem, Mozart changes the scale from F major to A minor. He decides to start with an A, he then goes up the scale to D sharp. But there is no D sharp in an A minor scale. Surely both Mozart and Salieri, who were two of the greatest musicians in their time, would've known that.
Corrected entry: During a game Mozart is dared to play a little tune in the style of Johann Sebastian Bach. This is in fact an error, because nobody could remember Bach in the late 1780's. Bach was completely forgotten about when he died in 1750 and remained forgotten until Felix Mendelssohn-Bartholdy discovered some of his work in the early 1800's. It is possible that Mozart knew Bach, but it is very unlikely that normal people, without thorough musical training, knew his name.
Corrected entry: In the beginning, when Salieri first meets Mozart at the archbishop's residence, you hear him in the background saying "that night changed my life", but through the whole scene there is sunlight coming in through the windows.
Corrected entry: In expressing his delight when the production of Mozart's opera "The Marriage of Figaro" is doomed in Vienna after the Emperor yawns during the performance, old Salieri remarks to the priest that Mozart "was lucky the Emperor yawned only once." However, there are actually two yawns in the scene. Looking closely, we can see over Mozart's left shoulder the Emperor, sitting in the front row, yawning over a minute before the yawn that is noticed by Salieri and his cohorts. (01:48:23)
Corrected entry: Several times during the movie, there is a harp shown in the background of shots (i.e.- in Salieri's studio). The harp shown has pedals on the bottom and a space for pedal levers inside the neck. However, the pedal harp was not developed until around 1810 and Mozart died in 1791.
Corrected entry: Mozart is asked to play in Handel's style. He waves dismissively, saying "I don't like him." In fact, Mozart greatly admired Handel, whose work had been a key part of his formative studies. (01:06:45)