I’m currently rewatching season 4—I’ve finished the first nine episodes—and I can certainly confirm all of this. It’s interesting that this approach—implying an affair without actually showing it—is used not only with Sally but also with Louella. The viewer got to see JR and Sue Ellen reconcile passionately after Kristin’s departure, and since then, she’s been giving JR plenty of TLC—even though we don’t actually see JR in action with anyone else. JR asks Louella how things are going in her marriage (her husband is often away on business) and suggests that he come to visit her; Louella is clearly delighted by the idea. The conversation with Sally followed the exact same suggestive pattern. It seems the decision was made back then to let the audience know that affairs were taking place without actually showing them—I wonder why that was?
Following the announcement of Priscilla Presley’s departure, a German magazine speculated that Charlie might turn out to be JR’s daughter. The theory was that, after breaking up with Bobby, Jenna had sought comfort from JR in a moment of weakness—resulting in Charlie’s conception. The reason for this potential plot twist was reportedly Larry Hagman’s strong desire to keep Shalane McCall on the show, because Dallas needed young blood, though that eventually arrived in season 12 with the character of Cally.
While it makes sense to me that JR would never have stood a chance with Pam or Donna, I have often wondered why there weren’t any hints regarding a connection with Jenna. If it had turned out in season 11 that Charlie was JR’s daughter, I surely would have considered it a poor twist back then; however, knowing how the final three seasons played out, it might not have been such a bad idea for Charlie to be JR’s daughter. Carter McKay could have had a grandson who became Charlie’s love interest—and if a younger sister for April was truly necessary, Charlie and Michelle could have competed for the affections of this McKay grandson. Perhaps that would have been better than any of the storylines involving James.
As for characters who were only around for a short time, it would have been interesting if Betty Lou—to get back at Alan for his fake relationship with Lucy—had gotten involved with JR. In fact, wasn't Betty Lou exactly the type of woman who should have appealed to JR?