Goofs

When Robin takes the cup of water up to Lord Melton, he is without his bow, but the bow is in his hand when he returns to Friar Tuck.

When Robin fires his first arrow at the pumpkin target a lackey is seen walking towards the pumpkin, but by the second shot the lackey is now seen standing still a long way off from the target.

(At 30 min) Before Robin and Marian kiss, he drops his bow to the ground. The next 2 angle shots, he's back to holding it. When they release their embrace, he's again without it. Then he picks it up off the ground.

Early in the film Robin is dressed in brown when he meets with the sheriff and Maid Marion.He rides away and arrive at the outlaws camp and now has a green vest over his original costume.

Maid Marion's dress has an obvious zip up the back.

Oliver Reed stabs Peter Cushing three times in the back but when he withdraws his dagger there is no trace of blood on it. (Though in fairness, this was intended as a family film, so it was likely a deliberate decision.)

A man as important as the Lord Chancellor would never have traveled across England with such a lightly-armed escort.

In one scene, Robin is asked to shoot at a pumpkin. Pumpkins are a New World squash; the earliest references to Robin Hood are from about 1228, well before Columbus' voyage.

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.

Friar Tuck's journey from Sherwood to Bawtry was done in the day; excellent timing as the journey is 68 miles there and back.