Sollozzo silently studying Michael at the dinner table at the restaurant while Michael tries to keep calm is definitely one of my favorites.

In Part II, we see a similar situation when Vito sits at the table with Fanucci.

I also enjoyed the moments of Mike and Fredo at the terrace in Havana.

And when Pentangeli and Mike discuss business in his Lake Tahoe's compound when Mike suddenly dictates Frank in Sicilian that his family is still called Corleone and he should act like one.

In Part III, when Mosca the assassins' kid acts like a donkey while seeing the expression on Mosca's face...

For the rest, the things you already mentioned.