At the dinner party at the beginning, a portrait of Captain Blackadder from Blackadder Goes Forth (1989) is positioned on the wall behind the present Blackadder.
Was shown at SkyScape attraction at London's Millenium Dome eight times a day for the whole of 2000.
In the opening credits, there is a photo of Blackadder in Indian attire. This is a homage to Rowan Atkinson's wife Sunetra Sastry, who was makeup on Blackadder II (1986) and is of Indian descent.
Brian Blessed, Elspet Gray and Robert East were originally going to reprise their roles from Blackadder (1982). The scene would have been Blackadder and Baldrick arriving at Bosworth field and killing Henry Tudor with the time machine, however the scene was later changed to the battle of Waterloo as Blessed was unable to reprise his role of Richard IV.
In addition to playing the various incarnations of Melchett, Stephen Fry reprises his role as the Duke of Wellington, though the character bears little resemblance to the version who appeared in Blackadder the Third (1987).
Jennie Bond: the voice of the Royal Reporter in the ending scene was the BBC Royal correspondent from 1985 to 2003.
Colin Firth: as William Shakespeare. His casting is likely an allusion to his role as Lord Wessex in Shakespeare in Love (1998).