Continuity mistake: In the scene just after Robin Hood jumps from the top of the burning castle, Skippy, the little boy rabbit is hanging on to Little John's arm. He first has three fingers and a thumb, then after a brief shot of the water, he has four fingers and a thumb. He switches back to three fingers and a thumb a few shots later.
Continuity mistake: Just before they sing 'The Phony King Of England', the mole says "Long live Robin Hood!" and you then see Robin and Maid Marion. Once they look at each other for a brief second, Robin's fur around his nose to his neck is brown and then turn gray before the next shot.
Continuity mistake: The Sheriff shoots his final shot and hits the bull's eye straight on. When Robin shoots, the Sheriff knocks the arrow into the air. Robin corrects the arrow's angle with another shot and the arrow also hits the bull's eye, splitting the Sheriff's arrow. But since it approached from an angle, there's no way it could split it right the way down the length of it.
Continuity mistake: After Robin Hood and Little John ran from the sherrif and his posse in the woods and swing up the tree you can see that both of them don't have arrows penetrating their clothing but after the sheriff and his posse leave you can clearly see that Little John had an arrow in his shirt and Robin Hood had an arrow in his hat.