woah weird
how does this get leaked? you never see this kind of thing.
Actually there's a lot of this off-air footage out there. It used to be that people who had these big satellite dishes in their back yard could catch the live, unedited feed of Smackdown as it was being taped. You'd hear the production staff on the commentary feed, the unedited commentary, etc. Even recently a whole episode of unedited Smackdown last year leaked with all the commentary intact. Since it's not live the commentators talk to the back more often, and it's edited off. You can hear Cole getting annoyed that he's being told to say the same thing over and over at one point.
And there's footage of rehearsals or voiceover recordings out there too, mainly from the 2000-2003 era Smackdown.