Wasn't there a 2nd episode where Rudy invited her friends over to stay the night? I watched an episode where twins, as Cliff would call them "double vision",
were singing a song. Wasn't there another
episode like that one or am I just imagining things?

That one when Rudy has her friends over for a sleep over is from the 1st season. I think I might know what you might be thinking about. In the 6th season Olivia has a birthday, and has friends over for her party. Would that be what you are thinking of?

Heather

I'm not sure if that's it or not. I know
two girls sing some weird song about "yellow buttons all down her back", that's a verse from the song they sing.
Does this sound familiar?