Episode III goof: Ring around the collar

This has been bugging me ever since I caught it the very first time I saw Revenge of the Sith. The scene where Anakin is on the slab, getting rebuilt into classic Darth Vader. Here's three cuts in succession. Notice anything wrong here?Give up?

Okay, in the top image there's Anakin in most of the Darth Vader armor (for the first time I'm noticing that he's not wearing the gloves) and the droid is lowering the facemask down onto Anakin's head. The next panel shows us Anakin's POV as the mask turns on, giving us the only glimpse in any Star Wars movie of how Vader sees the world behind the mask. The bottom image is just before the mask clamps down with the helmet completely sealing the head.

The "collar" that the mask hooks onto is missing in the first image, even though the mask is already on its way down onto Anakin's face. It mysteriously materializes around his neck just in time for the whole thing to come together around his head. The collar should be there during this entire cutaway to Palpatine's medical facility, but it ain't.

Maybe this'll be something they digitally fix for the forthcoming DVD release. Or for the "Ultimate Edition" six-episode multi set that you just know George Lucas will someday release with EVERYTHING corrected and amended per his grand master vision :-)