Production

Seasons 1–8

Series creator David Jacobs wrote the first and the final episode of the original five-part miniseries (season 1), with the other three episodes being written by Arthur Bernard Lewis, Camille Marchetta and Virginia Aldrige. While Aldrige didn't return to the series again and Marchetta left during season 4, Lewis grew to be one of Dallas's most influential writers.
Leonard Katzman had been a part of season 1 as producer, and during season 2 his influence increased, as he was given both directing and writing responsibilities. Halfway through season 3, Jacobs left his day-to-day duties of the series in order to focus on the production of spinoff Knots Landing. The executive producers of Dallas in the first 3 seasons were Philip Capice and Lee Rich.
During the first 8 seasons of the show, Dallas's production team remained basically intact (the main exception being Rich's leaving after season 3). After Lee Rich's departure, Philip Capice served as the sole executive producer, Leonard Katzman as producer, Cliff Fenneman as associate producer, and Arthur Bernard Lewis as executive story editor/supervising producer. And, although 25 writers contributed with scripts, the trio of Katzman, Lewis and David Paulsen wrote nearly two-thirds of the episodes during these first eight seasons. Paulsen had joined the show during the season 4 and was promoted to story editor for season 6. Notably, the three of them wrote every episode but two during the shows seventh and eight seasons.

Season 9

Over the first 8 years, internal, creative conflicts between executive producer Philip Capice on one hand, and Larry Hagman and the writers, most notably Leonard Katzman, on the other hand, had increased, finally resulting in Katzman leaving his position as producer of the show at the end of season 8.^[18] Although Katzman was to continue writing for the show during season 9, albeit to limited degree, as "creative consultant", the fact that neither Lewis nor Paulsen returned for season 9, meant that Dallas was faced with not only a new production team (joining executive producer Philip Capice and associate producer Cliff Fenneman were James H. Brown as producer and Peter Dunne as supervising producer) but also an all new team of writers (headed by Dunne, executive story consultant Joel J. Feigenbaum, and story editors Hollace White and Stephanie Garman). To make the change even more noticeable, the season 8 finale had also been actor Patrick Duffy's farewell to the show, with his character, Bobby, being killed off.
However, increased production costs^[18] and decreasing ratings^[7] caused production company Lorimar to persuade both Patrick Duffy and Leonard Katzman to return. And thus, as season 9 came to a close, Katzman had returned as a full-time writer, and the season finale saw Patrick Duffy inexplicably resurface on screen.^[19]

Season 10

So, as of the season 10 premiere, there was another major overhaul of the crew, with Leonard Katzman not only returning to the production side of the show but also getting promoted to executive producer, reportedly under the condition that he would get "total authority" of the show,^[18] while Philip Capice and most of the season 9 staff left the production. Alongside Katzman, David Paulsen was brought back as writer and the show's new producer, while the position as supervising producer was offered newcomer Calvin Clements, Jr. Cliff Fenneman remained associate producer. A new set of writers was hired to work alongside the producers, including Katzman's son Mitchell Wayne Katzman as story editor, Leah Markus as story consultant, and Louella Lee Caraway. Markus left after two years, while the others remained until the show's end.
Scriptwise, Patrick Duffy's return was explained by having the entire ninth season being a dream of Victoria Principal's character Pam, effectively sweeping away the events occurring during the period in which Katzman's involvement with the show had been minimized.
Even the cast were affected by the production and political struggles. Most famously, while Larry Hagman (J.R.) reportedly supported Katzman, and had played a great part in bringing Duffy back, Susan Howard (Donna), who also had written the script for one of the season 9 episodes, had sided with Philip Capice, and was opposed to the idea of annulling the events season 9. While she returned to write another episode for season 10, she left the show, both as a writer and as a cast member, at the end of the season.^[14][18]