Jayce makes a point of having to leave the Root and it's necklace aboard the Pride of the Skies II. But in several shots when he is sitting in the Armed Force vehicle, it is seen hanging around his neck.
Animation error: when Jayce says "We must not hurt them, they're just children, his neck moves through the collar of his tunic.
After one of the wizards exclaims "A Red Moon!", another wizard moves his lips for an entire sentence, but no sounds are heard.