The recruiting for the college program is a bit different I'm sure, but I was accepted as a CP. I can tell that during training Disney teaches you about guest service. So stressing the following is a good idea: listening to guests, making eye contact with guests, actively seeking out guest interaction (go up to them!), experience with people of all ages (child, parent, grandparent). The goal as a cast member is to treat people as guests in your home, hence the term "guest". You are supposed to accomodate them and make them feel welcome.
And show off your Disney knowledge! Use the terms cast member, guest, guest with a disability, etc. Mention specific Disney memories, experiences, rides, etc. Talk about Disney characters. They like to see that you have some background knowledge about Disney.
Smile. Put on that Disney face that everyone has. Be outgoing. Be friendly and talkative (without rambling). I don't know if that helps any. But good luck! I'm sure you'll do great!