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 2 weeks. I interviewed at Subway (Saint Bonifacius, MN) in Apr 2011
Interview
I was called to set up an interview, interviewed by the owner at the location the next day. He came to the interview late but overall a very relaxed 1:1 interview. I was asked to complete a few math questions to verify basic mathematic knowledge - primarily addition and subtraction relating to making change. Most US educated applicants should not have significant difficulty. Breezed through the list of interview questions and further discussed previous work and education experience.
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.