Patrick Duffy revealed how his miraculous post-death (post-dream) return was kept secret. His "Good Morning" shower scene was filmed in a seperate studio and all film crew were told it was an Irish Spring soap commercial! The director even faked authenticity by having retake upon retake for soap reasons. Duffy said it took hours.
Reminiscent to the infamous 9th season finale, Victoria Principal wakes up to tell Patrick Duffy of the renuion.
When reminscing about late actor Jim Davis who played Jock, Patrick Duffy stated that if Jim were around at the reunion, he would talk about the Oil Baron's Ball. However, the annual Oil Baron's Ball episodes weren't filmed until the seasons after Jim's death so he wouldn't have known about them. In fact, the first Oil Baron's Ball that aired was where the Jock Ewing Memorial Scholarship was established.
When the cast gave a question and answer session with the fans, Patrick Duffy did not answer any questions, even though he was seen on camera holding a card with a question on it.
If you look closely, you'll see that stand-ins were used for the actors to drive the cars to the ranch and most likely a stand was used for Larry Hagman in the helicopter too, except when the helicopter landed. The actors probably got into the cars after they were parked to make it look like they had all just driven up to the ranch.
Ray returns to Dallas and claims he stills own the land adjacent to Southfork, which Jock had given him. However, Ray sold his ranch to Carter McKay in Season 12 and Carter then sold it to Michelle Stevens at the end of the series.
We learn that J.R. shot the mirror at the end of the last episode of the show and went off to Europe.
When aired in reruns, the first half of "Conundrum" features the standard "Dallas" closing music over its credits instead of the extended closing theme that was written specifically for the finale.
"Last time on Dallas", the introduction shows every season finalé.
In this episode, Dusty Farlow says he sold his stock in Weststar to Carter McKay. However, in the previous season, it was stated that, per Atticus Ward's will, there was a five-year waiting period before Dusty could sell his stock.
Before he learned that James and family were leaving Southfork, J.R. wanted to turn Lucy's old room into a nursery for baby Jimmy.
Liz's departure is not explained at all. She simply disappears and is never mentioned again.
This episode is the first, and only, time J.R. Ewing is seen on a horse.
J.R. lectures Michelle and James about bringing various partners home to the ranch and says that his daddy built Southfork. This is incorrect as Southfork was built by Miss Ellie's family, the Southworths, and Jock only moved in when he and Ellie married.
In a close-up shot of McKay's appointment book indicating his meeting with Johnny Dancer, the name of Les Moonves, then the president of Lorimar Television, can be seen.
In McKay's appointment book, he has a meeting scheduled with Leslie Moonves. Leslie Moonves was president of Lorimar Television at the time, and would later become CEO of CBS.
In the real Sheila Foley's photo album there is a photo of Jordan Lee and the woman who pretended to be Sheila in Paris.
Sly says she can't imagine J.R. without Ewing Oil, but what about when he lost it before and he opened J.R.E. Industries?
Why would Bobby be driving to Odessa, TX? He could have taken the Ewing jet or the Ewing helicopter or even the Southfork helicopter. All of these would be faster then driving, and he says he is in a hurry.
When Liz asks Bobby if Cliff has any family he might be staying with Bobby says he has none, forgetting about Cliff's Aunt Maggie and his cousin Jimmy Monahan?