Although Larry Hagman appears in 7 episodes of season 2 he actually passed away during filming of the 5th episode. The Producers managed to keep JR "alive" for two more episodes by rewriting the script and stretching the footage he filmed out with the help of some dialogue reused from earlier episodes.
The sudden death of Larry Hagman meant that there was no death scene filmed for JR. Producers then went through every bit of footage filmed with Hagman as well as every piece of recorded audio to find suitable pieces to use. The final shot of Hagman was actually taken from an unused scene in an earlier episode where JR finds out that John Ross and Pamela are sleeping together. It was originally filmed on Southfork but the background was digitally removed and replaced with the red background of the hotel room JR was killed in.
Mitch Pileggi, who plays Harris Ryland, also appeared in the original Dallas (1978) playing two completely different characters: a Cowboy in a bar and "Morrissey". Brenda Strong also appeared in the tenth season of the original series, playing "Cliff's One Night Stand".
This was Larry Hagman's final acting project. He died during the middle of the filming of season 2 episodes. Hagman's character (J.R. Ewing) appears in the first 7 episodes of season 2 but the character is killed off because of Hagman's passing in real-life.
With the beginning of season 3, the show's opening credits properly adopts the style of credits from the original Dallas (1978), i.e. displaying three images of each of the main actors along with their names.
Before the series entered development, there was a rumor that a big screen film remake was in the works with John Travolta and Ben Stiler were considered for the role of J.R Ewing and Jennifer Lopez and Jessica Simpson being considered for the role of Sue Ellen. Bill Paxton was considered to play Cliff Barnes while Owen Wilson was on the running for the role of Bobby Ewing.
The 'Dallas' font typeface seen during the opening credits was used by 7-Eleven for their 7-Election promotional campaign - the font typeface is used on the 20 oz coffee cups for Barack Obama and Mitt Romney supporters. 7-Eleven Inc. USA headquarters (formerly The Southland Corporation) is based from Dallas, TX.