The transformation scene is basically the same in each of the eps that has one. They are different lengths though. "Fly Away Now" is the song. Here is a video of one that I think is about the right length: transformation, battle, and defeat (of ghost) all in about a minute:

http://www.youtube.com/watch?v=tD2qDkzmcUA

The latest episode 10 was something of a departure for the show. Instead of the usual 2 mini eps there were either 3 or 5, depending on how you count. The first was a fairly typical episode with lots of potty humor. The second ep. was presented as three short eps featuring Chuck, the demented, ever-regenerating pet of the girls. It had a lot of film parodies. The final segment looked like one of those weird grim arthouse Japanese movies from either Germany or Japan in the 50s or 60s, all in black in white. Someone who knows film better than I do could probably name the specific movies.

The final segment was a music video. I don't know music videos at all, so I could only spot the really super obvious ones (like Abbey Road). But the fans at MAL have created a list of at least 30 songs or bands that have direct parodies all within this 3-minute sequence. There were several (brief) shots of the girls in un-superdeformed style in this video.