In my experience, a lot of interviewers will ask questions along the lines of "What's the trickiest problem you've had to deal with?" I feel like those kinds of questions are excellent for bringing up this sort of thing if the candidate is so inclined. If they go in a different but still not disappointing direction (e.g. coming up with a process for stable development an environment where requirements are constantly changing), you might re-ask with the focus more on problems encountered while coding.