Is there any humor or meaning to the conversation about Yuri's dream and how many Hinatas there were? In episode 5, Otonashi and Angel had a conversation about Yuri's dream and how many Hinatas there were, which seemed totally random and out of nowhere. When I first watched that episode, I didn't get the humor and meaning that I expected were there in the conversation. Is there a joke or meaning to those remarks, or are they just some disposable lines?

The curious conversation between Otonashi and Angel

音無：「すまん！ゆりの調子が不安定だ。 原因は、昨夜夢に日向が出てきて……」
日向：『今日の俺と明日の俺が同じ俺だと思うな。気を付けな。』
音無：「……と忠告してきたことによる。そして今、その忠告が事実であることをゆりが証明しちまったところなんだ。」
天使：「日向君は二人いるの？」
音無：「あ、ああ、そういうことになる。」
天使：「三人以上いるかもしれない？」
音無：「え？ああ、ありえる。」
天使：「お気の毒に。」

Otonashi: Sorry! Yuri's a little emotionally unstable. Because last night, Hinata showed up in her dream and—
Hinata: Don't think that the me from today and tomorrow will be the same. Watch out.
Otonashi: That's what he said, and Yuri just proved it.
Angel: Are there two Hinata-kun's?
Otonashi: Y-Yeah... that's right.
Angel: Is there a chance that there's more than three of him?
Otonashi: Huh? Oh, uh... it's possible.
Angel: I'm sorry to hear that.
The joke here, I think, is that before this conversation, Hinata showed up in front of Yuri and behaved very differently from yesterday (before Yuri dreamed about him), so Otonashi said that the warning came true: Hinata really changed. Since Hinata said, "don't think that the me from today and tomorrow will be the same", tomorrow, he might change again, making Kanade say that there could be more than three of him.