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 5 days. I interviewed at Subway (Los Angeles, CA) in Feb 2014
Interview
Got called to go in to an interview same day. Didn't ask much. Mainly talked about how they needed people to start asap. Said he would call me next day. Three days later he called for me to go in the next day before he made his decision. When I went he said i started the following day.
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.