@bus accident ending #1: I believe it's in the real world because the dream world disappeared after the original LB crew started to vanish. And I don't really believe Kyousuke could keep it up by himself. They *were* strong enough to deal with reality and managed to get the heck out of the forest (barely in time).
@bus accident ending #2: I love happy ending more than anything else *glares at Air*. That being said, the only BS was the whole time travel thingy in order to cure Riki's sleep illness. Wasn't this the purpose of dream world 2 by Riki + Rin? Anyway, them saving the whole crew with power of friendship, miracle and bro-power was also fine with me.
(That's why I was perfectly fine with Clannad's miracle ending. Yes, they deserved that happy ending, no but's and if's
)