• Larry Hagman (as J.R. Ewing) is the only actor to appear in all 357 episodes of the series.

• 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.

• Larry Hagman was not the first choice for J.R. The part was offered first to Robert Foxworth who refused it, but later took a similar role on "Falcon Crest" (1981). Likewise, Ken Kercheval was originally to play Ray Krebbs, while Steve Kanaly was to play Bobby Ewing. Linda Evans was to play Pamela, and Mary Frann was to play Sue Ellen

• The "Who Shot J.R.?" episode was the highest rated single episode of a television series until the finale of "M*A*S*H" (1972) ("Goodbye, Farewell, Amen") beat it in 1983.

• 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.

• When Barbara Bel Geddes first left the show, Larry Hagman suggested that his real life mother, Mary Martin play Miss Ellie.

• Several former cast members returned for the final episode including Linda Gray, Jack Scalia, Ted Shackelford, and Joan Van Ark. Victoria Principal was also invited to participate but declined

• 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.

• Larry Hagman (John Ross J.R. Ewing, Jr.), Patrick Duffy (Bobby Ewing), Ken Kercheval (Cliff Barnes), Linda Gray (Sue Ellen Shepard Ewing) and Steve Kanaly (Raymond 'Ray' Krebbs) are the only actors to appear in both the first and last episodes of the series.