Basically it's just the cast appearing one by one, telling you how each of them got cast in the film and how great Mike Myers is to work with.
You learn nothing about the making of the film at all.
The only interesting bit is George Clinton's interview. He talks about writing the theme for Dr Evil: "I wrote the music the way Dr Evil would like to hear it."
He also said that this movie's score is the best score he had ever written.
But it would've been nice if the producer, DP, production designer or costume designer would be interviewed. It would be nice to hear how they wanted to make this movie look like it was made in the 60's.
But alas. Maybe in a future Blu ray release.