There are probably many backstories given for this piece.
The story I was told that a professional actor had been hired to narrate a technical bulletin on the servicing of a new automatic transmission.
Prior to "Take One" the camera crew and the actor were screwing around with lighting, audio, settings for pan and close-ups and the like.
And the actor ripped out 90 seconds of unmitigated and totally inspired bullshit to give them something to work with.
I stand in awe.