Question about Rog+Bri Interview on "Live at the Bowl"

Hi folks.
There's another question I'd like to ask. It concerns the hilarious DoRO-interview with Roger and Brian on the bonus disc of the "Live at the Bowl"-DVD (the one which is best remembered for prominently featuring a mirror.) The question is whether the one we see on DVD is the FULL interview or whether there are longer versions or additional material. I ask this because I seem to remember snippets of this same "mirror"-interview in some DoRo-Documentary which don't feature in the version seen on "Live at the Bowl". I think they were talking about the recording of the Flash Gordon Soundtrack, but it could've been something else.
Alas, I'm unable to check this, since my video collection is momentarily unaccessible to me. So any comments on this would be helpful. Thank you.

It's most likely that they just used parts for the DVD.

It seems to me that parts of this interview with Flash Gordon discussion are shown in Magic Years documentary.