V01 - Oh yeah, time is pretty fluid. Hiro's jumping around can't really be completely good for the integrity of the universe, as much as he's attempting not to change things, he is, in fact, doing exactly that. He's trying to take the "I'm just an observer" approach, but he's enough of a hero in his own mind that if someone asks for help, he's not really likely to refuse them.

V02 - Ah, you're that Elle, eh? Definitely don't want a repeat of the graveside scene. My assumption is that she managed to sneak Adam out from under his nose so that it's going to be a bit before Hiro twigs to the fact that Adam is, indeed, on the loose.