Very simple and straightforward. Normal questions like availability, have you worked in food service before, etc. I think it depends on location though since friends at other locations have had more substantive or less substantive interviews.
I applied online. The process took 1 week. I interviewed at Subway (New York, NY) in Mar 2015
Interview
Quick and painless. Every basic question you'd expect when applying for a job at a fast-food chain. Management was polite and made the interview comfortable. It was a relatively painless process.
Straightforward and professional with typical fast food interview questions. Friendly and easy to talk to interviewers. Reasonable length and in person made it more comfortable. Great experience and easy interview.
Was pretty average hospitality interview process, focus on customer service in a fast paced environment, how to deal with stress, team work/ collaboration, company values, and your past experience. and availability etc.