"I really wasn't on the Dallas set much. I did three or four episodes so I didn't see too much"

Ted Shackelford's quote suggests that he was not a major part of the Dallas set. He was just present for a couple of episodes, so he did not get to experience the complete scope of the program. This might mean that he was not a significant character in the show, or that he was only a visitor star. It might also imply that he was not a part of the program for very long, and that he was only there for a few episodes. Whatever the case, it is clear that he was not a major part of the program, which he did not get to experience the complete scope of the program. This could be due to a variety of reasons, such as scheduling disputes, or merely due to the fact that he was not a significant character. Whatever the case, it is clear that Ted Shackelford was not a major part of the Dallas set.