I would assume there were things you loved about the school when you interviewed and not just speaking with an interviewer. You can say I have spoken with faculty / students and their enthusiasm about the program is infectious. You can mention parts about the program you learned without saying they provided the best lunch on interview day. Essentially, the interview day is not indicative of the program or staff you would interact with as a student, there should be underlying things you loved about the program - talk about those. You can also learn stuff online, through friends, or just by walking on campus, they don't have to be linked to an interview.