Rik Mayall (better known in the series as Lord Flashheart) makes his first appearance in the series in this episode as 'Mad Gerald'.
The cold opening of "The Foretelling" says Richard IV reigned from 1485 to 1498. This episode starts in 1498, but Edmund is stuck in a cell for an entire year and Richard IV is still on the throne.
The Hack: God save the King.
The Band: Cause no one else will.
Edmund: Why? Because, Percy, far from being a fit consort for the Prince of the Realm, you would bore the leggings off the village idiot. You ride a horse rather less well than another horse would. Your brain would make a grain of sand look large and ungainly and the part of that can't be mentioned, I am reliably informed by the women of the Court, wouldn't be worth mentioning even if it could be. If you put on a floppy hat and a funny cod-piece, you might just get by as a fool, but since you wouldn't know a joke if it got up and gave you a haircut, I doubt it. That's why you're dismissed.
Percy: Oh, I see.
Edmund: And as for you, Baldrick.
Baldrick: You're out too.
Baldrick: Fair enough.
Prince Edmund: (weakly) Harry...what are my chances?
Harry: Oh, very good.
Queen Gertrud: He will live?
Harry: Living? Oh, I thought you meant of going to heaven.
Prince Edmund: (weakly) Damn.
Richard IV: The Black Dagger!
Prince Edmund: (meekly) Black Adder!
The credits has the actors listed as "Cast in Order of Disappearance".
Edmund: All for one.
The Band: And each one for himself.
This is a play on a very famous motto of the musketeers in Alexandre Dumas's book: Three Musketeers.
The original text is Unus pro omnibus, omnes pro uno in Latin, which meana One for all and all for one.
Edmund: We few, we happy few, we band of ruthless bastards!
This line when Edmund is drinking with the other members of the Black Seal is a play on the famous speech from Shakespeare's "Henry V" which starts off with: 'We few, we happy few, we band of brothers.'