The movie as we now have it is without its original opening sequence, which was cut; apparently, it depicted the Lord being murdered while on crusade and his squire fleeing to Sherwood Forest on his horse. As it is, the movie now opens with him riding into the forest on horseback and his identity is never revealed.
Desmond Llewelyn, Nigel Green, Richard Pasco, Brian Rawlinson, Charles Lamb and Ivor Collin all appeared in The Adventures of Robin Hood (1955) while Terence Fisher directed eleven episodes of the series.
Oliver Reed's voice is not heard; he's dubbed throughout by another (anonymous) actor attempting to sound like Reed's normal voice. Reed's own voice is heard in the film's trailer, where he adopts a very camp lisping French accent.
It is fairly obvious that the film was made in Ireland and that much of the smaller part casting was done there; the people in the inn in Bawtry and the nuns in the priory all spoke with Irish accents.