Hinton Priory, in Somerset, was the location used for Leaford Grange.

Farleigh Hungerford Castle, on the border of Somerset and Wiltshire, was the location for Nottingham.

Acre, as in the title of this episode, refers to a city in modern day Israel. During the Crusades, this was an important city and was captured and lost several times.

Will: You'll get too big for your boots you will.
Robin: Then I'll get bigger boots!

Robin: Evil to him who thinks evil.

Robert de Rainault, Sheriff of Nottingham: So, Robin Hood has crossed you, has he, de Villaret?
Reynald De Villaret: Robin Hood?
Robert de Rainault, Sheriff of Nottingham: Ah, of course you've been away, haven't you? The so called King of Sherwood, a dangerous rebel.
Reynald De Villaret: Does a girl fight with him?
Robert de Rainault, Sheriff of Nottingham: Yes I believe so.
Reynald De Villaret: And a friar? A fat friar?!
Sir Guy of Gisburne: That renegade was the sheriff's chaplan!
(Sheriff looks daggers at Sir Guy of Gisburne)
Reynald De Villaret: They'll all die! All of them! We've sworn it.
Robert de Rainault, Sheriff of Nottingham: Have you now? Then I give you my blessing, de Villaret.
Come on Gisburne! It's time we left the brothers to their - devotions.
Sir Guy of Gisburne: Mylord, I must protest!
Robert de Rainault, Sheriff of Nottingham: I'd rather you didn't. (Sheriff getting angry) Just get back on your horse and stop making an exhibition of yourself!!

John: Who are they?
Marion: Templars.
Tuck: Poor Knights of the Temple of Solomon.

The Knights Templar or Poor Knights of the Temple of Solomon, were a group of knights who, despite taking a vow of poverty, were a very wealthy and influential order. Although a monastic order, their job was to protect pilgrams on their way to the holy land, and fought along side King Richard, the King of England (1189-1199).