Rowan Atkinson has a stutter, which causes him to struggle with the letter 'B.' He has to visualise the letter before he says it - which is why he puts extra emphasis on words containing that letter. Eg Bob. Later he created the character Mr. Bean (1990) for this reason.
In the unaired The Black Adder: Original Pilot (1982), Blackadder was portrayed as a devious and scheming character. When the series was picked up, however, Edmund Blackadder was changed to an intelligent but sniveling weasel; according to Richard Curtis, he thought it would make the character more complicated and interesting rather than present him as a swaggering hero. In the final episode of the season The Black Adder: The Black Seal (1983), he begins to show signs of his scheming self, and in later seasons (generations?) the character is the Machiavellian cynic the show is better known for.
This season had the largest budget in the series, with a multitude of extras and props (horses, armour, etc) and on-location shooting at actual medieval locations. Rowan Atkinson has described shooting as being extravagant: "It cost a million pounds for the six episodes, a lot of money to spend... it looked great, but it wasn't as consistently funny as we would have liked." In partial consequence, the later shows had their budgets, casts and sets scaled down.
The first episode was aired in Sweden on February 22, 1986. The second episode was supposed to have been aired one week later (March 1), but was postponed for a week, because most of the air time of Swedish television on that day was occupied by the news of the murder of Swedish prime minister Olof Palme on the night before.
According to the opening credits, King Richard III was succeeded by his nephew, Richard, Duke of York (Harry and Edmund's father) in 1485. In fact, young Richard was only 12 when he and his brother Edward disappeared under suspicious circumstances in 1483, with no children of their own. From this, it can be ascertained that all of the Blackadder canon takes place in an alternate historical timeline.