In the second joust at Ashby, they joust with blunted lances. During the charge, the templar's lance clearly lacks the metal end-cap. In the next shot, when he makes contact, the cap is in place.
In the final showdown between Ivanhoe and Brian de Bois-Guilbert, Ivanhoe cuts Brian de Bois-Guilbert's shield in half. In the next scene we see Brian de Bois-Guilbert turn his horse for a new charge, and his shield is undamaged. But when he reaches Ivanhoe, the shield is broken again.
Queen Eleanor: It matters not to me if all the nations of Christendom know that Queen Eleanor's sons are curdle-brained ninnies, so incapable of settling their differences that they have to send for their mother to do it for them!