The sheriff and his party arrive on foot at the tournament field which can be seen to be a good distance from the castle. They would surely have gone by coach.
When the Sheriff and his entourage arrive at the Fair, behind them in the distance a vehicle crosses from left to right.
The opening credits roll over a shot of a castle and there is a vapor trail in the sky above the battlements.
Some of the costumes, like those of the soldiers, have obviously been zipped up the back. When Roger de Courtenay confronts Will Scarlet, you can catch glimpses of the zipper on Roger's tunic.
When Friar Tuck and Robin de Courtney are beset by Nottingham's men in the forest, Tuck is wearing a wristwatch on his left arm. As the rest of the scene unfolds, he keeps his left wrist covered, obviously having realized that he had been wearing the watch.