If you watch the Sanders/Casper match from TCC carefully, you will note that the match started with the players teeing off into the rising sun on Hole #1, and finishing the round into the setting sun on Hole #18 - an example of the technological limitations of filming matches in those days. With moving cameras around the golf course, it took the entire day to film the match. It may be my imagination, but over the course of the long day, Doug Sanders' mood seemed to become more "convivial" for lack of a better term, a circumstance that did not endear him to Mr. Casper - particularly as Sanders' care-free late afternoon play resulted in a dramatic comeback.
The Nelson/Littler match from Pine Valley was reportedly filmed over two days, with very long delays between shots, a reason, perhaps for some of the inexplicably poor shots played by Gene Littler.
For those who are interested, there are two books that document the history of the Shell's series: Gene Sarazen and Shell's Wonderful World of Golf, by Al Barkow and Mary Ann Sarazen (Gene's daughter); and My Mulligan to Golf, by Fred Raphael, the show's producer, with Don Wade.
Both books are pretty light, but entertaining, nonetheless.