1. Hiro still doesn't think his father has a power. Not that he's had much time to stew on it just yet, but if pressed he wouldn't think that knowing how to swordfight counts, and nothing else would occur to him.

Posing the question would make him picture his dad in a Buffy outfit, though, so that's probably part of it.

2. Even with everything that's gone on Hiro's got enough sense to realize his "Flying Man" and Peter Petrelli are related, and are probably brothers because of their age, but he doesn't like to dwell on it because it makes him wonder about his sister and he really wants her to stay in charge of the family company where she's safe and happy.

3. Hiro has had a more active sex life than you'd think. He's usually the sweet one-night-stand women feel really guilty about having led on.