Revealing mistake: There are two Ewoks Wicket's parent is in search of. One of the those Ewoks is climbing down a mountain and the other has finished climbing down. As this happens, look at the Ewok not climbing. As he bends down, 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. (00:07:50)
Revealing mistake: When the light goes in The Gorax's face, The Gorax starts hitting the rocky cavern walls next to him. As he does this, the walls wobble showing us it's a fake.
Revealing mistake: As The Gorax walks down the stairs, when the parents attempt to trip him up, the walls wobble and vibrate.
Revealing mistake: Just as The Gorax falls to his death, the ground is seen wobbling.
Revealing mistake: When the Ewok throws a stone at the Gorax, he acts as if the stone is hitting him but you can tell the stone never actually entered the shot.
Suggested correction: This isn't a mistake. That's him, under the water in the same pose he was in before he touched the water.
After watching the scene, the mistake is valid. When he's underwater, he's not in the same "pose." That would require him to be upside down and squatting. But that's not the pose we see him in.
Bishop73
We see Mace semi-kneeling and reaching out to touch the water when he vanishes, but his upside-down reflection is still in the exact same calm position even when he's gone, and in the next shot we see Mace under the water right-side up, with his arms reaching up to the surface. This is a valid mistake, the suggested correction is not right.
Super Grover