Got there early and waited in a comfortable lobby that played the Transformers movies. Everyone was extremely friendly and it's a relaxed, pleasant atmosphere. Was asked to fill out a pre-interview paper (nothing difficult: availability, name, if you want to be considered for other positions, ect.) which you take into the interview.
When your name is called you are led into a small room with multiple cubicles and asked to sit in close proximity with the interviewer. Standard questions, like "why do you want to work Universal?"
After that, if they like you they will go over job specifics and double check your availability. Then they will offer you the position. If you accept you are asked to wait in the lobby again (I waited about an hour) until you're called to take a photo ID, get fingerprinted, and receive your paperwork and orientation info!
(Dress business casual or business formal!)
(Smile!)
(Know your social security number!)
(Make sure you have the verified forms of ID they ask for when you apply)