Other mistake: During the scenes of the invasion of Normandy, stock footage of U.S. Marines, Marine landing craft, Marine tanks, etc., conducting landings in the Pacific theater is used.
The Revenge of Robin Hood - S1-E16
Other mistake: Robin Hood and his men ambush the king's cavalry as they ride by the group, but all the arrows hit the riders frontally in the chest - the arrows should be striking home on the left sides of the cavalry troopers.
The Revenge of Robin Hood - S1-E16
Other mistake: During Robin Hood's attack on the castle, the same crossbowman is seen getting shot and falling off the castle wall twice.
The Revenge of Robin Hood - S1-E16
Other mistake: As the King's guards prepare to torture Doug and the Earl of Huntington with red-hot irons, one of them is handling the irons without gloves or any other non-conductive material to prevent his hands from being fried.
Other mistake: Usually Master Sergeant Jiggs and his men are posted as guards in the Time Tunnel control room at all times, but when Merlin shows up in the control room a second time, there are no guards to be seen.
