There can be many things that he might expect there are no such three things, the Interviewer is only looking at the way you are going to think and answer and also expects to bring some of your bad things out.
Let me answer this.
Ans: Change in our self is something that happens rarely we like our self so much we never know what we do is right or wrong, although we might be able to indentify few errors it is very difficult to change however the following I would like to emphasize if given a chance to change.
1. Insecurity, 2. Vanity, 3. Shyness