[tet68]

For me it was when Mozart began playing Salieri’s piece
after hearing it just once, then began playing it backwards...

[TheErnFormerlyKnownAsBig]

That was an examples of a talented man seeing how much the difference was between his high talent level and pure genius.... Not quite the example I was thinking of another great time in the movie how Salieri was constantly being humbled. I was referring to how and authority figure or a government official with power can stifle genius

[re_nortex]

Here's my favorite clip from the movie, edited down to the essential parts: Mozart Vs Salieri. One of the YouTube comments is spot on IMHO and aptly characterizes Mozart's genius but his naivety:

Mozart is unaware that he has just humilliated Salieri; he honestly thought he was helping him.

In spite of taking, ahem, liberties with the biographies, it remains an enduring, always enjoyable film.