Koong is supposed to have only four fingers on each hand but when he is being treated for the Rooze sickness in bed, and later where he is operating the large cannon, he has five.
When Nilz Yomm applies a medicinal spray to his wife, his arm completely disappears for a couple of frames.
When Gaff stabs himself in the leg by accident, the section of his cape that is visible between his arm and his body disappears for a couple of frames.
R2-D2 has been hit by a molecular disruptor and has shrunk to the size of an action figure. When the effects begin to wear off, he begins to grow back to his original size while standing on a table. But in the next shot he appears to have grown smaller again.
The large mirror inside the cave reflects a different version of the droid's color schemes (but does not have the same effect on Mungo Baobab). When Threepio tells Artoo to come along, the droids standing in front of the mirror are given the distorted colors instead of the other way around.
Mungo embraces Auren in the final scene. When it cuts to a close up of C-3PO, the background plate remains the same.