Bingowings wrote: they inserted a green 1950's style robot into the Jawa droid sale which creates another continuity goof when it fails to appear in a later shot.
Guessing they are referring to either:
R1-G4 : 
or one of the low domed LIN-V8K droids: 
Here are the results of the BR changes via the MF.com thread and the OT.com SE changes threads:
https://plus.google.com/photos/102542760950977079734/albums/5647165429128459745?banner=pwa
here's a good Astromech resource page: