It is noticeable throughout the run of this show, (and particularly in the second series) that in most of Paul Eddington's scenes, he is sitting down and wearing very heavy make-up. This was due to the fact that Eddington's health had begun to deteriorate and production changes had to be made to accommodate and disguise his condition.
Every episode, but one, ends with Sir Humphrey and/or Bernard saying, "Yes, Prime Minister". Mrs. Hacker said it in one episode.
This series is a direct continuation of the events in the final Yes Minister (1980) episode "Party Games", which could in turn be watched as the "backdoor pilot" for "Yes, Prime Minister".
Due to Paul Eddington's deteriorating health, the scripts were prepared in a shorter duration than Yes, Minister. The reduced intricacies are visible to careful viewing.
Ronnie Hazlehurst's theme-tune is composed around the chimes of Big Ben at the Palace of Westminster.