Here's what he had to say:
"It’s really a great script, it’s really funny. That’s why I’m a little hoarse. I spent five-and-a-half hours today for our fourth session,” says the actor/comedian, who reprises his role as Mike Wazowski in the Monsters, Inc. prequel.
"This movie ends where the other one starts. It’s college pranks with monsters. And I wear a retainer. Mike has a retainer"
You can read Crystal's complete comments over at the Times' Hero Complex.
Monsters University releases in theaters June 21, 2013.