I just watched, for the fist time in many years, The Making of Star Wars, and I noticed something about one of the minor droids. I have always really liked the appearance of the hemispherical droid that the Jawas on Tatooine have for sale (shown on the far right below).
In part, I like it just because it is so abstract. It rolls around, and it has a couple small things protruding from its apex, but we are generally left with no clue whatsoever what its function might be. However, when I watched The Making of Star Wars, I spotted what was located under that hemispherical dome.
Underneath, there is actually quite a bit of decoration, which is obviously never seen when the droid appears with the dome in place. What's the story behind this? Was this a dual-use prop that was, without the dome, going to appear as a different droid elsewhere in the story? I don't recognize that prop from the final 1977 release, but it might be in the background somewhere, or it might be in footage that was shot but not used.