The format of the Blackadder series was changed substantially after the BBC was displeased with the first series (The Black Adder). It was made as a standard studio sitcom with an audience, the characters' roles were redefined and the budget substantially trimmed.
According to producer John Lloyd, Ben Elton was particularly keen on making the Elizabethan age the setting, calling it "a sexy age that the kids can relate to."
Richard Curtis has said this show was the happiest he has ever worked on, due to the cast being reduced to a small number of familiar actors (he compared it to a "friendly bunch of school chums."
Ben Elton proposed that Baldrick, who was the most intelligent of the main cast, become "the stupidest person in the history of human beings" to act as a foil to the now-smarter Blackadder.
The series was the originator of Baldrick's obsession with the turnip; this arose from a botanical error on the part of Ben Elton, who confused the vegetable with the "amusingly shaped" parsnip.
Rowan Atkinson, who wrote for the first series The Black Adder, did not wish to continue writing for the second series, so writer and stand-up comedian Ben Elton replaced him.