Producers originally planned to bring back Jock Ewing's character, but fans were against having anyone play Jock Ewing except Jim Davis. Steve Forrest appeared on the show as Wes Parmalee, claiming to be Jock Ewing, but it was revealed that he was not.
When Victoria Principal opens the shower door in the infamous Bobby shower scene, actor John Beck was the one in the shower. The shock to Pam was supposed to be that he had been killed. The shot of Patrick Duffy was inserted later. Actually Pam would not have been shocked to see Mark (John Beck) in the shower considering that his character had been brought back during the "dream season" and she had married him earlier in the very same episode.
Victoria Principal refused to appear in the final episode because there was a good chance the show would return the next season. She said she would only appear if she were 100% sure that the show wouldn't return.
In episode 145 Peter's Principals, the character Clayton Farlow mentions he is taking Miss Ellie to see Camelot as there is an actor with quite a good voice playing the role of Arthur. Howard Keel, who played Clayton, had starred as Arthur in numerous stage productions of Camelot.
Originally, Linda Gray's Sue Ellen really didn't have a part, so it was up to her and Larry Hagman to improvise their scenes in the background. Fortunately, Leonard Katzman and others saw their work in the dailies of the episodes and Sue Ellen's character was fleshed out.
Linda Gray was fired from Dallas after begging the executives to give her a chance to direct like Larry Hagman and Patrick Duffy. However, Larry Hagman threatened to leave the show because he didn't feel they could have JR without Sue Ellen.
When Patrick Duffy was asked to return to the show in 1986, his wife told him that the only way it could happen is if his character had actually died in a dream. This led the producers to decide that Bobby Ewing's death (in addition to the entire 1985-86 season) was just a figment of Pam Ewing's imagination.
The house used as the "Southfork Ranch" house was an actual Texas residence, owned by Joe R. Duncan, or J.R. Duncan. When the show became popular, tourists from all over the world visited the house day and night. The Duncan family was forced to sell the house and it is now a museum devoted to the show.
Several actors including Charlene Tilton and Jim Davis were filmed firing the gun that shot J.R before it was decided who would be the shooter. The gun is on display at the real Southfork Ranch site in Dallas.
When Steve Kanaly was talking about leaving the show due to his character's lack of development, it was Larry Hagman who came up with the idea to make the Ray Krebs character the illegitimate son of Jock Ewing in order to get Kanaly to stay
In several of the early episodes of the series, Lucy and Ray were often portrayed as lovers. However, when it became revealed that Ray was Jock's illegitimate son, his affair with Lucy was never mentioned again.
Spinoff show Knots Landing was actually created first, but the producers were unable to sell it. They developed Dallas instead and when that became a success, and the network asked for a spinoff, they were able to dust off the Knots Landing idea.
Barbara Bel Geddes is only nine years older than Larry Hagman, though they played mother and son. Hagman is 18 years older than Patrick Duffy, who played his younger brother, though we assume them to be only a few years apart in age.
Morgan Fairchild played Jenna Wade, Bobby's childhood sweetheart, in a 1978 episode. When Jenna was seen again for two episodes in 1980, she was played by Francine Tacker as Fairchild was busy working on her own series 'Flamingo Road' (1981)_. In 1983, with Flamingo Road now canceled, the producers approached Fairchild to reprise the role but she declined feeling that she did not want to return to a small role. However, the producers decided to recast the role with Priscilla Presley and the character became a series regular for five years. Fairchild later claimed that her mother never forgave her for turning down a role in her favorite soap.
Barbara Bel Geddes left the show in 1984 due to the producers not agreeing to her demands for a pay rise, and Donna Reed took her place the following season. When Bel Geddes decided to return in 1985, Reed was fired. Reed sued the producers of the show for breach of contract, who settled with her for an undisclosed sum of money. Ironically, Reed died (of cancer) in January 1986, mere months after she left the show which meant she would not have been able to continue for the duration of her contract anyway.
Several references were made during the show's run about Clayton Farlow having a past history of singing. Of course, Howard Keel, the actor who portrayed Clayton, was famous for his powerful bass-baritone singing voice.
Jenilee Harrison has the distinction of playing the only character to be killed off twice. Jamie Ewing Barnes was killed off the first time in the last episode of the "Dream Season" when she was blown up in her brother's car. The second time came midway through the next season, when she was killed while rock climbing in Mexico. Though the second death didn't occur on camera.
In May 1981, Delta Burke landed the role of Katherine Wentworth but she was forced to turn down the part because she was contractually obligated to the then-yet-to-be-picked-up series Filthy Rich, which was a spoof of "Dallas".
Barbara Bel Geddes appeared in all the episodes of the series, for her first six 1/2 seasons, missing 2, also, 1/3 due to her March 1983 quadruple by-pass heart surgery, allowing her to recover the following year, at the time Donna Reed replaced her and got fired, before returning to Bel Geddes's role for the 1985-86 season before her second departure at the end of the 1989-90 season, where she appeared in all the episodes for 5 more seasons, missing 4, for a total of 278 of the 357 episodes, and almost stayed through the entire run.
Patrick Duffy had wanted the lead role in the 1986 series Heart of the City. When Robert Desiderio was given the part (with a young Christina Applegate playing his daughter), Duffy decided to return to Dallas. Heart of the City lasted only 13 episodes while Dallas remained on the air for several more seasons. Desiderio later appeared in a recurring role in the Dallas spin-off, Knots Landing.
Originally, the show was intended as a starring vehicle for Victoria Principal due to the fact that Pam would act as a buffer between the Ewings and the Barnses and J.R. would have been more of a supporting character. However, the producers were so impressed by Larry Hagman's portrayal of the immoral J.R. that he immediately was bumped up to be the show's main character.
In Season 10, JR attempts to weaken OPEC's influence over the price of oil by hiring a group of mercenaries to blow up several oil fields in the Middle East. This storyline is loosely based on Texas businessman Ross Perot's mission to rescue American hostages in Iran in 1979.
Instead of Bobby's shower scene cliffhanger, the original cliffhanger for Season Nine involved the revelation that Ben Stivers was supposedly Jock Ewing. In the Season Nine finale, Miss Ellie and Sue Ellen are shown searching Southfork for Clayton. Sue Ellen leaves to go to Ewing Oil and gets caught in the subsequent explosion intended for JR. The original plan was to then cut back to Ellie, who has stumbled into Ben's quarters in her search for Clayton. There, she discovers her letters to Jock and some of his other belongings. Ben arrives and tells her that the items are "his." This is basically the same scenario used in Season Ten for the scene between Ellie and Wes Parmalee when Wes first hints that he is Jock.
Barbara Bel Geddes was living in New York when cast for the series. Throughout the making of the series, Bel Geddes would fly home to New York and back every weekend and on other breaks to be with her family.