After killing a clumsy assassin, Monday finds a young girl trapped in a closet. After freeing her, he goes out of his way to return her to her parents while protecting her from zombies.
Lizzie's kitty, Cuddles. Everything he does to try to reunite with his owner is just adorable.
A flashback Lizzie has features her dad telling her where ice cream comes from (it involves pirates and Santa Claus!). Later, she tells this exact same story to two children who couldn't have been any older than she was when she was told about the history of ice cream.
Pretty much the entire chase scene while the gang was on their way to the grocery store: Every other page had at least one of the main heroes do something totally awesome.
In strip #300, Lizzie remembers when she first met Monday (And the fact that he stiffed her on the bill), corners Monday, then makes him pay for the meal right there.
This update. The gang might have been kicked out and are back on the streets without even Lou's van, but darned if they won't continue kicking ass regardless.
Moral Event Horizon: Arlen when he brutally double-crosses the heroes with Chantelle only a few steps behind. This soon comes back to bite them in the ass; Lou's disabled van leads one of Monday's fellow hitmen to their door.
Nightmare Fuel: The implication that the local military is kidnapping women in order to... "repopulate" the world after "the end."
Holy Jesus, Frank! How many severed heads are you going to be carrying around!?