The furniture race sketch involves an item called Joanna Southcott's box. Joanna Southcott was an self-described religious prophetess who lived 1750 to 1814. She made many prophecies which are kept in a box which can only be opened at a time of national crisis and in the presence of 24 bishops of the Church of England. So far the box has remained unopened as the Church of England is reluctant to participate as it would attract what it considers unnecessarily public interest in the affair.
The theme song and action in the opening credits of "The Attila the Hun Show" was directly copied from the short-lived American sit-com The Debbie Reynolds Show (1969).
In the cricket sketch, a chesterfield sofa appears and joins the game. Douglas Adams (author of the "Hitchhiker Guide to the Galaxy) described a similar event in his book "Life, the Universe and Everything" when Arthur and Ford used an eddy in the space-time to come back from prehistoric earth to the modern time - they rode on a chesterfield sofa that was drifted in the eddy and landed with them in Lord's cricket ground. Adams was involved as a writer in the Flying Circus.
Eric Idle appears in blackface in The Attila the Hun Show... which is today considered extremely insensitive and offensive in some people's opinion. His character's name is "Uncle Tom". John Cleese also appears in blackface (as a cricketer).