What I think are the best TV golf innovations, many of which have already been mentioned:
1. Color. Frank Chirkinian marveled at how it changed broadcasts when CBS went to color for The Masters in 1966, a year after the U.S. Open and Western Open were shown in color. Old black-and-while telecasts might as well have been newsreel film.
1A. High-definition (and 4K). Color helped with the immediacy of the coverage. Done properly, HD takes you inside the picture.
2. High tracking camera. An ABC innovation, still used extensively at the British (!) Open. Roone Arledge wanted to see the ball against the landscape, not just against the sky. ABC had cameras as high as 250 feet in the air at one time.
3. Hand-held fairway camera. Another ABC first. Shows the shot as the golfer sees it. Debuted around 1974 and revolutionized both the picture and the commentary.
4. Shot-tracking. Perhaps overused, Fox began to use it, partly because its camera crews had great difficulty following the ball in the air at its first U.S. Open. Best used on a graphic overlay of the hole next to the live picture.
5. On-course commentary. Bob Rosburg was the first (1962 World Series of Golf, NBC) and remained among the best until he retired.
6. Slow-motion. Used less on golf than any other sport. Good for swing analysis if the analyzer knows their stuff.
7. Replay and time-delay. The pace of modern telecasts is far different from those through the early 1970s, when directors had to know who played fast and who played slow, because there weren't replay units to capture every shot. Now there are, and "just earlier" is the common phrase to let us know something isn't live. Sometimes, next to nothing is live.