Carly Mallenbaum

USA TODAY

It's true: Before 'The Force Awakens,' C-3PO always had a silver shin.

On Monday's red carpet for the world premiere of Star Wars: The Force Awakens in Los Angeles, actor Anthony Daniels said the different-colored limb on the otherwise-gold protocol droid was overlooked by many fans.

Daniels recalled, "Even the stills photographer, John Jay, came up to me one day and said, 'Why are you wearing a silver leg today.' Now, he was the stills photographer, and he hadn't noticed."

Actually, the leg caused some problems for filming.

"It would reflect the gold leg, and it would reflect in the desert, so it acted more of like a mirror," said Daniels.

So, Threepio was fitted with two gold legs for The Force Awakens, instead.

(Director) JJ decided, let's make it noticeable with a red arm. More of that later.

And though Daniels' costume got an update, that doesn't mean he could move freely in it: It's still impossible to sit in the droid suit.