Yes, it'll look good when you reapply and they ask you what you've done to prepare for the interview, you can tell them that you got feedback from last time and have worked doubly hard on the area where you let yourself down on to ensure it doesn't happen again.
I was lucky enough to get through Stage 3, but if I hadn't then I'd have reapplied with much more confidence next year as if you know what's going to happen on the day then you've got a massive advantage over everyone else there.