I learned of the jobs/job fair from an ad the company posted on Craigslist. They were hiring cooks, cashiers, and an assistant manager, if I remember correctly. When I got to the job fair (they were holding it in the restaurant as the employees were preparing to open), I was asked to sign in and wait to be called for an interview with some extremely unprofessional, t-shirt-wearing ladies (they didn't even look like they worked there. It seemed they were relatives of the lady in charge, even!). Due to the open nature of the burrito joint, all of the applicants were sitting wherever they could find a place at the tables, and the ladies were interviewing at random places in the room, wherever they could find two seats.
I was called about 15 minutes later by the lady who looked like she was in charge (she was wearing a contemporary blouse instead of a t-shirt). The questions were typical, but it seemed like a BIG DEAL that I'd never eaten there before, even though I'd thoroughly researched the company. The employees preparing ingredients in the background were so loud that I could barely hear the woman, and she had such a thick accent that I could barely understand her questions at times. Even if she hadn't, it still would have been exceedingly difficult to hear her in the loud room. The interview was pretty short, thankfully. If they liked you, you got an application to fill out on the spot.
I don't think many people, if any, had good interviews in that environment. The establishment has been marketing like crazy in the area, so I'd go as far as to speculate that the "job fair" was also a publicity thing. I don't know why they'd hold an event in those overly-difficult conditions otherwise. If you want to work for them, make sure you have eaten there before and know all about their company.