Now, several years ago when I interviewed with a frickin' huge aerospace company who shall remain nameless, my experience was similar to yours. The interview was a panel-style discussion with the hiring manager and several engineers. They had to follow a script given to them by HR and ask every candidate exactly the same questions in exactly the same way. It was.... surreal. At one point I was asked something along the lines of (my memory is a bit hazy here) "Describe a time when workplace diversity significantly contributed to the accomplishment of a challenging project."
"Oookay. Uh... Well.... Uh... So... Hmm...," and so on and so forth.