...
Well, i watched the Rifftrax with the color version and it worked perfectly. There's even a riff that's directly related to the color of the space maidens. So i can only assume that Mike & Fred were watching the color version as they riffed, and that's the version that Rifftrax intended to be used.
Of course... none of that really answers your question, at all. So i'll just shut up now!~
-Rude