Hordak is fading in and out of existence after being poisoned. However, during several lengthy sequences when he is being carried by She-Ra or on Swift Wind's back, he never fades in or out at all. The animators were unable to add the effect as long as Hordak was close to or touching other characters without having the others fade in and out as well.
When She-Ra and Bow converse after she blows the Troopers away, the camera position switches between the two of them but the background remains the same.