I was also caught off guard by the interview style! It was a behavior-based interview but when one of the 4th year vet students called me I asked her questions about the interview style and she said it was the regular kind and they might ask you about your views on current events in the US and Canada.
I was glad that I also went on an interview at Western University, which also does the behavior-based style, so i had some practice answering the questions.
The one thing I didnt like about PEI were the classrooms.