More patient w the arms and keep the lats engaged better to move the bar back into the lap as it passes the knees. Keep the pressure on the heels longer (aim to keep the heels down until the bar is at upper thigh).
Smooth out the dip for the jerk - little to abrupt moving down and he drops out from under the bar momentarily. Make sure the knees are unlocked before the dip starts. That will help prevent his upper back from collapsing that little bit. Also a bit more patient w the arms - wait a split second longer to start pushing w the arms so he can get more leg drive into the bar and a little better position. Can probably adjust the jerk rack position a bit too by spreading the elbows instead of having them as high and toward the midline as they are.