There are two Ewoks Wicket's parent is in search of. One of the those Ewoks is seen climbing down a mountain and the other has finished climbing down. As this happens, look at the Ewok not climbing. As he bends down, you can see half way down his left leg, there is some sort of fold there. This is mainly due to the fact that the Ewok actors wore costumes whilst filming. The fold is coming from the Ewok costume.