Panel 2: Heh! Did the ARB Shannon know what a stroke is? I think she did.
Panel 3: Ooooooooooooh! Is April being INSENSITIVE?
Panel 4: Crud. It's just more of the Quiet Wisdom of the Differently Abled. Why do they all travel in packs, anyway? And does Shannon count them as her friends or not? ETA: And a few things I didn't notice: the frieze that says "Yes we can! Yes we can!"; the fact that the special-needs kids get an extra big panel, presumably mandated by the ADA; and the tote back on the back of the kid's chair that says something I can't quite make out. I think it's "On a Roll", though; that would make more sense than "Win a Ball", which is what it looked like at first.
I just don't feel like saying it again. So I won't.
Meanwhile, re: the icons, here's a PDF that may be of some help. http://www.abanet.org/litigation/committees/intellectual/roundtables/0506_outline.pdf#search=%22copyright%20satire%20law%22