Continuity mistake: In the extended version of the DVD, there's a scene where Constanza goes to sleep with Salieri. In one shot there's a very prominent candle next to or just behind her on her right that smoking like it's just been extinguished. But from the front view there are no candles that close to her, and the ones a short distance away are all lit.
Continuity mistake: When Salieri has brought Mozart to bed and they are talking, Salieri is holding the candlestick. In the different views - from Mozart's and Salieri's - it can be seen that the angle he holds the candles changes. The line between the candles changesi. So Saleri held the candlestick in another angle the second time the scene was shot.
Continuity mistake: When Mozart and Salieri are discussing why Marriage of Figaro failed, a statue of a black man can be seen behind Mozart. In one shot, when Salieri invites Mozart to see his new piece, the statue isn't there. In the next shot, it's back. (01:50:25)
Continuity mistake: In opening scenes Salieri has blue eyes. After that his eyes are brown.