I think posture and dorsi-flexion are good to cue during these drills. I hate seeing toes drag, heads down, butts out, etc.
When I first started using the drills I was a little more strict about form. I like them for dynamic warm up and building in/displaying (diagnostic) movement qualities/patterns as mentioned above. One of the biggest things I've changed though is shaping the movement towards things I like to see, but above all else keeping the movement relaxed and free flowing. When I start working with the majority of people, the ability to relax while moving the limbs and applying force is seriously lacking.