First, Professor Schellenberger makes a recommendation about dynamics and sound balance. In this kind of works, it is important to respect all the dynamic indications to understand the performance. The rhythm also must be very clear, and the entries very precise.
Schellenberger also suggests that the beat should be constant and then he insists on 'motif' issues: location, appearance, which instrument has to play them, etc. Finally, there are also particular corrections on accents and articulation.