Jim,
One is JN felt a green sub target area (like a raised shelf) should be at least 40 feet wide for him to shoot at it. Since then, I have proposed that as the minimum, and some folks actually ask how I arrive at that. Telling them Jack said so doesn't always convince them that shooting at smaller targets isn't wise in their case.
Jay also reinforced that Jack (and to be fair, I also learned this from Colbert) that pros hate aiming out over trouble, such as water on the right of a green where the wind blows left, and we worked harder to avoid those situations, aligning all the greens with the wind, with hazards on the downwind side. Actually, Jay had a similar approach in his own work - I got the feeling where Jack went go almost surreal lengths to avoid situations he didn't like, Jay realized that they do occur and allowed them every so often. Sometimes, if we ran across that situation, we would just leave a fw chipping area as a bigger bailout.
Jack preferred double deck (front low, back 1-2 ft. higher) on long, downwind par 4 holes, where he could use reduced spin to run the ball up to the upper deck.
There is more, but most are similarly specific design ideas on what makes a course play "correctly."