Here are a few things... David Leadbetter used a technique called PNF (not sure what it stands for) to help learn or correct certain swing mechanics. For example, for spine angle retention, he would push on the front of the student's head with a foam floatie, but have the student resist the push.
Dr. Paul Schemp says to analyze a student's strengths and weaknesses, but tell them what they do well. Ask them how they can be better, then tell them how to become better.
Give feedback only on one thing, until that thing is mastered.
Use metaphors when teaching... "Deliver the pizza"... for Top position.
Hank Johnson likes EYES CLOSED DRILLS.
Jim Hardy has a book coming out called "The Plane Truth".
Stan Utley is putting on an arc. "Take the left forearm and open the face on the backswing." He feels like he is slightly hitting down on the putt, and has a slight forward lean of the shaft at impact. "Cover the ball." He believes the putter should have 3.5 to 4 degrees loft at impact.
He believes some mechanical thoughts are GOOD in putting. He likes to be process oriented, rather than target oriented. "Worrying about the outcome gets in the way of the process."