For both Sherean and Robin,
I read a piece or someone's advice somewhere that was geared towards the entire application process. He/She/They said that they approached each piece as a way to tell something different about themselves that couldn't be found anywhere else in the application. How is this useful for the interview? Well, the interviewer will certainly ask you about parts of your application so try to expand upon what they've already read/watched. If they ask about your film/photo submission, that's your chance to give them some info that you weren't able to include in the submission.
My interviewer was very relaxed, it was like a casual conversation, but not all interviewers are built the same. Also, listen to how and what they ask about. For example, if I'm the interviewer and I say "I really enjoyed your film submission. Could you tell me more about how you shot it?" Well, what sticks out is that they enjoyed it. So after you're done answering the question maybe ask them what part of it was most enjoyable for them? This creates a nice little dialogue if you're interviewer is up to it and gives you a bit of time before having to come up with an answer to the next question. I think having a dialogue with an interviewer adds to the connection, memorability.
Lastly, I sent a follow-up email the same day thanking them for their time and also making references to what we talked about such as thanking them for letting me explain such and such or that I was glad that they enjoyed such and such. I ended it by saying that I will hopefully be able to thank them in person one day. Although they say the interview isn't a guarantee of acceptance I think being grateful that someone even wants to spend a little extra time speaking with you should be shown in your enthusiasm for the interview and appreciation for the interviewer.
(Bonus: Further down the line when I did get accepted I also sent a final email again, thanking them and letting them know that I was accepted)
Hope any of this helps. I think the biggest thing that I liked about mine was that it was a dialogue. We just chatted.