Ryan McAvoy said:

Apparently this (From another public info film) is from 1976, a year before Star Wars... (Click to play YouTube clip)

...So the prequels were almost right. Vader did build one of the Droids but it was actually R2!

!Bombshell!

(btw Getting waaaay off topic here lol)

It's funny that RMQ's designs of R2 had that spinning thing on his head too:

This early one......they didn't use his voice

But getting back to the original subject.....there was quite a lot of droid activity in that room that 3PO went into, maybe it was a droid toilet, maybe the voice was George Michael