[anotheryou]

The best advice I got (but not about technical stuff or homework):

Identify a problem the company has and offer a solution. When exactly to play the card in the interview is up to you, maybe you can even phrase it in to a question, I think most employers ask if there are any further questions at the end of an interview. If you can than sprinkle some expertise on the solution, even better (comparing it to some problem you solved in the past, not bragging about expertise).

If you can't find anything concrete, maybe you find a few maybes you can ask for and have a solution ready when they admit that something is a challenge. They definitely will see that you know where things could get difficult.