I'm sure the shippers will be all over Hiro's mumbling of Sae's name in her sleep.
What happened to the newbies? I've been hoping to see more of them beyond their brief appearances, if only because we haven't had much chance to get a firm grasp of their personalities.
Something which gives me pause whenever I'm watching shows like Hidamari Sketch is the way they include stuff that I feel I should know about, but I am not privy to every minute detail from every extra or bonus or omake or spinoff or whatever. These things are usually put in as a bonus for the knowledgeable viewer, and shouldn't detract from the basic enjoyment of the story, but when enough time to be noticeable (generally more than a couple of seconds) is spent lingering on the Oddly Significant Character or something, I get the feeling that I'm missing something.
Hopefully the mystery of the girl in the screenshot will be solved soon enough, preferably within the anime itself.
On an unrelated note: don't worry, Yuno. I've also done that before.