The format of the Blackadder series was changed substantially after the BBC was displeased with the first series ("The Black Adder" (1983)). It was made as a standard studio sitcom with an audience, the characters' roles were redefined and the budget substantially trimmed.
The opening title sequence of the snake crossing a marble table is a parody of the title sequence of _"I, Claudius" (1976) (mini)_ . Patsy Byrne, who played Nursie in "Blackadder II" (1986) appeared as Martina in _"I, Claudius" (1976) (mini)_ .
The writers realized that they had to rewrite the character of Queen Elizabeth I after they saw Miranda Richardson's wonderfully silly interpretation.