The adorable soot ball creatures are working so hard, one of them collapses pitifully under the weight of the coal it is carrying... Chihiro helps it out, taking the coal off it and putting it in the furnace for the soot creature. The other soot creatures' response? They all pretend to be crushed by their coal.
No Face's spewing, roaring rampage dwindling down to stumbling after Chihiro and hacking up some goo, after which he politely excuses himself.
Yubaba's frantic search for Boh.
YMMV, I found that rather heartbreaking.
Chihiro's tentative climb down the very high, very long staircase to the boiler room—then when one of the steps near the top breaks, her running full-speed down the rest of it, screaming at the top of her lungs, and finally crashing into the wall at the bottom.
When Yubaba tells Haku that she's going to give Chihiro one final test, a whole crowd gathered on top of the bathhouse boos Yubaba and she yells, "SHUT UP!" and they quickly retreat.
Mouse!Boh and a sootball re-enacting Chihiro squashing the slug and Kamaji ridding her of the bad luck. You can't help but admit that it's funny and cute at the same time.