In Star Wars Episode I - The Phantom Menace (1999) in the scene right after Anakin, Amidala and the two Jedi land on Coruscant, Palpatine's costume bounces back and forth in mid-conversation between a green and a blue color scheme. The most noticeable thing is the color of his collar.
Apologies for the potato quality video below. It's all I could find
At 4:12, the collar and trim are clearly green.
Palapatine paces back and forth and then turns at 4:33 and bang, the collar is as blue as blue can be.
There are several good clear views of the blue collar and then at 5:18, right the middle of the conversation, the collar is suddenly green again.
And it's not just the rotten quality of this video. The goof is much more noticeable at Blu-Ray quality or above