Instead of doing what Hera told him to and staying with The Ghost while the rest of the crew steals an Imperial shipment of fuel, Chopper goes to look at a leg that would replace his mismatched one. Eventually, he steals it, and since The Ghost has already left without him, he escapes aboard an Imperial freighter. Later, he contacts Hera, who's angry about his disobedience. After she says, "Really? So you didn't leave The Ghost to go after that leg?" he appears a bit ashamed (doing what is apparently the droid equivalent of scratching his head in an act of discomfort, unwilling to admit the truth). In this shot, the leg is looming behind him, almost as if weighing on his shoulder in a picture of his guilt:
