Available on BBC iPlayer, but apparently incomplete
I've just watched this on BBC iPlayer, and don't remember any footage featuring Juliette Lewis or Pink, who are listed on the IMDb credits for the film. IMDb also lists it as 103 minutes long, while the BBC version lasts only 90 minutes.
Here's the link if you're interested:
http://www.bbc.co.uk/iplayer/episode/b0755ms6/janis-joplin-little-girl-blue