Continuity mistake: During the first fight scene in the castle, the fourth guard to die charges through the castle door and is killed by Robin Hood. The shot cuts and the guard is immediately followed by Sir Guy, but in between those two shots an arrow suddenly appears in the door which wasn't there before.
Revealing mistake: When Robin jumps off the scaffold after being saved from hanging, you can see one of the soldiers spear tips bend under his weight.
Continuity mistake: The horse Robin is on when he is exhorting his men to return to Sherwood and the one he is on when he rides over to the right to slash the portcullis rope could be two different horses as their saddle cloths are different colours.
Continuity mistake: In the scene where Robin is rescued from hanging, watch the shadows on the church in the background. It keeps going in and out of shadow.
Continuity mistake: In the final swordfight, Basil Rathbone lunges past Errol Flynn, who dodges him and leaps to the floor below. Rathbone continues on dropping his sword at the base of the steps. In the next cut, however, the sword lies between Rathbone and Flynn - a good eight feet away - allowing Robin Hood to pick it up gallantly and offer it back.
Continuity mistake: The scene where Robin is being chased through Sherwood Forest, early on in the film, is supposed to be taking place at night. But, at several times, blue sky can be seen overhead. This was corrected on the DVD.
Continuity mistake: After escaping from hanging, Robin heads for the castle gate. The first time we see it, the portcullis rope Robin later cuts is hanging away from the castle in a nice loop. In the next shot it is hanging vertically, but reverts to being a loop again for the rest of the scene.
Continuity mistake: Robin, in his escape from the scaffold, pauses on his horse before the portcullis and exhorts his men to return to Sherwood. He then rides over to the right, draws a sword from behind him and slashes through the rope which activates the portcullis and rides the rope to the top of the wall. No sword is seen on the horse when he is exhorting his men.
Continuity mistake: During the first fight the fourth guard Robin Hood kills is the one who charges through the castle door. This guard is shot right in the heart causing him to clutch were the arrow is protruding from his heart as he dies with first his left hand and then his right hand on top of his left after he drops his sword. He then fall forwards, his body coming to rest face down, still clutching the arrow with both hands after it becomes still. But in the next scene his body is laying on his back facing up he is still clutching the arrow with his right hand but his left hand is laying by his side. Even if one of other guards had rolled him over it should have been his right hand that would have fallen off first, because it was on top of his left hand.
Revealing mistake: At the end, when Guy loses the sword fight with Robin Hood, his body topples over a parapet and falls to the stone floor below. In the initial shot of him falling, it's a stunt man (who apparently broke his ankle in the process, according to the dvd commentary), but the next shot of the body landing makes the use of a dummy a little too obvious: the "corpse" bounces back up several inches before settling to the floor. (01:30:00)
Other mistake: At the beginning of the movie in the castle two servants pull out a large chair for Robin to sit down. After the spear is thrown at the chair Robin picks it up over his head and throws it a good 15 feet. Quite a feat for something that was made out of solid oak.
Continuity mistake: In the scene near the beginning when Robin is in the "great hall" -- a spear is thrown at his chair. He arises in time to avoid injury, but the spear goes through the back of the chair. However, the next time you see the chair, there is no hole in it.
Continuity mistake: When Robin escapes from hanging, he jumps from the scaffold onto his horse and rides off, all with his hands tied behind his back. When he jumps, just briefly before the shot changes, you can see his hands break the breakaway bindings and grab the horse's saddle.
Continuity mistake: In the feast in the forest scene which occurs after Robin Hood and his men capture Sir Guy's entourage, Robin sits next to Marian and offers her a roasted bird. She refuses the bird, but when the camera cuts back to Robin he has a mutton leg. Next the camera goes back to Marian who looks at Robin who now has the bird again.