The commentary came straight from Disney's first DVD release of the film. And on that particular release, Gonzo's and Rizzo's comments would lead to some behind the scenes clips. I don't have the new Blu-ray release, but are you saying that the behind the scenes clips aren't included?
That is indeed what I am saying! Gonzo and Rizzo's intros for the behind the scenes "Hidden Treasures" are still on the commentary, which can be very confusing to anyone who has not seen or heard the original commentary. It's like this:
2002 Commentary:
Rizzo: Stop the movie we have to show you this!
(the movie would then automatically pause and go into a "Hidden Treasure" behind the scenes clip.When it was over it would go back to the paused movie)
Rizzo & Gonzo together: We're back! (The movie would continue to play until the next one)
2013 Commentary:
Rizzo: Stop the movie we have to show you this!
(Nothing happens two seconds latter)
Rizzo & Gonzo together: We're back!
So you can see how confusing that would be to someone who has not seen the original. My thoughts on this where the fact that they had two movies on one disk, and more then likely ran out of room. If that where the case then they should have ether deleted Gonzo & Rizzo out completely, or just recorded a new commentary with them all together.