Has anybody else noticed all the little musical jokes in Salieris music?

[MissLimLam]

Like the "prima donna" aria Sulle mie tempie.... with its 'parody' on Baroque opera, or the weird change in key between the recitative and aria (non vo gia che vi suonino... which is brilliant, go listen to it)... there are so many other examples, but I cant be bothered listing them all.
I love salieri!