I used to work here in college (along with the Interlude bar and Catering dept). Good times were had here behind the register :)
We always made coffee fresh each shift. Coffee and soda are cheap. Best bet for a good meal is to get a sandwich, we made those fresh to order (dinners are just microwaved). In the daytime there's an assortment of baked goods, at night it's just cakes & pies. If it's going to be a busy night and you want food, make sure to go early to get a table and get your food in time, as there will be a long line.
Tip - if you want something to eat during intermission, place your orders ahead of time, and it will be waiting for you at a reserved table when you get out. Only desserts and drinks are available after the show ends.
There's a parking lot underneath that used to be free, and street parking in the neighborhood is usually easy.