The entire concept of Roger being pushed around in the wheelbarrow (covered in guns and ammo) is just amusing.
"We got this man! We got this by the ass!"
The montage of the four survivors running around and having fun in the mall.
The bikers throwing pies at the zombies.
When the bikers raid the mall, they waste their time looting useless things like money and jewelry, which no longer has any value. One picks up a dress shirt and tie...then promptly puts it back, because even they aren't stupid enough to want that.