Richard asks his eldest (and favourite) son, Lord Harry Plantagenet, Earl of March, for his younger son's name, but mistakenly calls him "Edna", starting a long-running gag throughout the series.
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In the Black Adder, Richard IV's Queen is Gertrude of Flanders; from 1482 to 1506, the County of Flanders was in fact ruled by Philip the Handsome, Count of Flanders.
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Harry is also styled Earl of March, a title actually held by one of the young nephews of Richard III, Edward, Duke of Cornwall until 1483.