Steve Staley has said that he had difficulties finding the right voice for T'Phai until after the Tophet episode arc was finished. He has stated that the right voice for T'Phai was found on the episodes when T'Phai became a good guy.
This series was supposed to have 40 episodes, but due to resource problems, the project was eventually cancelled ending at Episode 37, the mission where the Roughnecks had to defend Oahu with Johnny Rico being the lieutenant.
This series gave Dizzy Flores an actual name. In the novel, Flores was a male, and a very minor character. He was referred to as "Dizzy" several times during his one scene, and it is unclear as to whether that was his name or a nickname. In the 1997 Starship Troopers movie, he was turned into a female love interest, though it is still never clearly stated as to whether or not "Dizzy" is her legal name. On the Roughnecks series, one of the writers just decided to give Isabel as the legal first name, hence "Isabel 'Dizzy' Flores."