Ah what a great show. "Yes, Always", was a real favorite, because even in the '90s when it came out, I was in on the joke, having previously heard the infamous Orson Welles outakes.
“Hey bud, if you don’t mind me asking, what happened to your head?” “Nothing. I’m a mouse in a large, mechanical suit.” “Haha, okay, my fault for asking!”
(Brain's suit made numerous appearances on Animaniacs, PatB, and PEatB)