One interesting question I got... say 2 candidates were the same in hours, letters, etc but one had a less stellar gpa why shouldn't get go with the candidate with the better gpa?
Also depending on the time of year also changes your chances. I went for an interview and was told once I'd wasted all of the travel money that there were 2 spaces in the class left. Don't hesitate to ask about these things as the year goes on and you are possibly making choices to do the travel. If I had thought to, no way would I even have bothered to give that program a chance at that point.