When Aella has Ragnar stand against a tree, he is being held by two soldiers with two nooses around his neck. In order for Ragnar to speak, the nooses are taken off. In the next shot, they appear, then they vanish again.
When Ragnar is first presented to King Aelle in his cage, the stationary wagon's wheels change position from close-up to long shot, apparent by the two parallel beams on the outside face of each wheel.