The interview is fairly relaxed. They seem to care more about availability more than anything. Make sure to dress business casual at least to show some respect and make a good impression. Stress your ability to work in a fast-paced environment and adherence to "the customer is always right".

I was asked a bunch of formula questions about my "personality", which for one thing, doesn't tell you if a candidate can do the job, especially in food service, where let's face it, people will give a job to a relative with no job experience and it's often people's first job. He did asking me a lot of bartender or job troubleshooting questions which I think are generally relevant and useful.