Near the end, when Sise Fromm turns his head and says "They might be successful, but this time I'll do it alone", a section of the back of his neck disappears and reappears a couple of times.
Near the end, when Tiggy says "It worked, my satellite worked! We can set up again, somewhere else..." the blue headgear visible on the very top of his head disappears and reappears a couple of times.
When the large green droid is bullying Threepio, a cylinder attached to his right leg (for viewers on the left) disappears for a couple of frames.