Character mistake: After firing Percy and Baldrick, Edmund says to Baldrick that he'll probably go back to shovelling dung in the gutter where Edmund found him. In the pilot episode The Foretelling, Edmund actually met Baldrick when Baldrick was pouring a drink for Edmund.
Plot hole: In 'The Foretelling', it is said that Richard IV reigned for "13 glorious years" with a caption showing 1485-1498. 'The Black Seal' starts on St. Junipers' Day, 1498, but Blackadder spends 12 months locked up with Mad Gerald. So when the Royal Family are finally murdered it is actually 1499.
[Blackadder puts the phone down.]
Baldrick: Who was that?
Blackadder: Strangely enough Baldrick, that was his Holiness Pope Gregory IX, inviting me to join him for drinks aboard his steam yacht, the Saucy Sue, currently wintering in Montego Bay, with the England cricket team, and the Balinese Goddes of Plenty.
Baldrick: Really?
Blackadder: No, not really. I've been ordered to HQ - no doubt means that idiot General Melchett is about to offer me an attractive new opportunity to have my brains blown out for Britain.
Trivia: The original footage of the famous final scene was very disappointing. The set was small, and the cast only charged forwards a small distance before unconvincingly falling over when "shot". The scene was saved in editing, slowing down the video and audio enormously, and fading to an empty shot of no-man's land, then the poppies. The final result has been described as one of television's most powerful endings.
Question: Many times during the series, Lieutenant is pronounced as 'Left-tenant'. Why?