Tim McInnerny had declined to continue his role as Lord Percy or take the part of the foolish Prince George in Blackadder the Third (1987), for fear of being typecast as an idiot; as a consequence, his part in the fourth season is much more shrewd and wicked than any of his earlier characters.
But this is brave, splendid and noble...
Lieutenant George: ...Sir
Captain Blackadder: Yes, Lieutenant.
Lieutenant George: I'm scared, sir
Private Baldrick: I'm scared too, sir
Lieutenant George: I'm the last of the tiddly-winking leapfroggers from the golden summer of 1914. I don't want to die... I'm really not over keen on dying at all, sir.
Captain Blackadder: How ...
Throughout the series, Blackadder and George, both front-line officers in the trenches, are show with their rank insignia displayed on their cuffs, whereas Melchett and Darling, staff officers, are shown with their rank insignia on their shoulders. In reality, this would have been reversed: Cuff insignia was the standard, but front-line officers were allowed to wear theirs on their shoulders to make them less conspicuous to snipers. Shoulder insignia eventually became an army-wide personal option in 1917, and made permanent in 1920 when the cuff insignia was abolished completely.
The closing credits are notably presented as static captions, instead of scrolled down as in the previous three series.