Professor Poppen mainly makes corrections about metrics and tempo: Siciliano should not be so slow, but more like walking, more fluent. However, Vivace should have a more "dancing" tone. In this second movement, he also makes some suggestions regarding the articulation and the duration of the notes.
In the third movement, it is advisable to feel the swing of the dance (in three parts), as well as playing the final note without fermata.