I have owned a bad bootleg copy for years, but you can now get it "for real." It aired on my tenth birthday - no wonder I'm such a fag hag!
What I remember most about Roz Kelly is that she ended up on the Jenny Jones Show years later and she looked like Hell. Jones was her usual stupid self and tried to get Kelly to talk about "how great it was working on Happy Days," but Kelly kept saying over and over how she barely spoke to the other actors and how she wasn't really a regular on the show and how Henry Winkler passed her on the street and didn't recognize her, and on and on she went refusing to play ball with Jones. And it turns out, Kelly got involved with some really unsavory charecters in real life. More power to her.