I'm hoping this is a joke that I overlooked, because I think it's rather unlikely that you're going to get an interview with Neil Gaiman jumping up and down on a trampoline and incidentally says 'I love her sister' to one of this twin daughters. Also, I'd hope Cory Doctorow doesn't wear that cape in every interview.
Fair enough (and I had to google Cory Doctorow). I think it's possible then that some clips were specifically recorded for this, and others just caught from other videos.
The clip of Lessig is actually from his appearance on the Colbert Report, where Lessig gives viewers explicit permission to remix, despite Colbert threatening to get "very angry and possibly litigious".
The voice might actually be Lessig purposely recording for this creation.
