I applied online and was invited to interview within a few days. They took me to a management office and asked me some basic questions. I hadn't prepared as well as I'd have liked to, so was convinced I hadn't got the job, but was offered the position soon after. After talking to the other Christmas temp hires, many of whom said that they had also interviewed poorly, it seems that they may have hired everyone who got an interview, although I can't be sure that this was the case.