“Interviewing to get a car loan is almost completely absent from today’s lending models. However, local banks and credit unions may want to meet you just as a courtesy or to put a name to a face (superb customer service is usually how smaller banks can survive).
Since it’s a phone interview, odds are they just want to clarify some information. Maybe they want to confirm your income or occupation, offer you additional products like gap insurance, or request more details. I wouldn’t worry about it too much.”