The parody of Don Giovanni, complete with a dove flying right out a horse's ass.
"I'm a famous horseman!"
"And we're a famous horse!"
When the Emperor asks Mozart to name them a German virtue and he names 'love'. The entire bit that follows:
Salieri:(sarcastically) Oh love! Well of course, In Italy, we know nothing about love!
(Salieri, Kappelmeister Bono and Orsini-Rosenberg laugh)
Mozart:(Completely serious look on his face) No, I don't think you do. I mean, watching Italian opera — all those male sopranos screeching, stupid fat couples rolling their eyes around. That's not love, it's just just just just ... rubbish!
(Kappelmeister Bono giggles nervously until Orsini-Rosenberg shoots him a withering look)
When Salieri is first trying to find Mozart, he notices some waiters passing by with some chocolates, and immediately abandons his search for Mozart, and follows them with a perfect "Oh, I'm getting me some of that" face.