You can get slim jims by also hitting the trash can and that red lever near Burt's. Also hitting the orange cone, the fire hydrant and the pigeon.
Also, if you jump up and down in between the holes coming down from the owl you get a slim jim but only think you get it that once. Also, the sewer lid too, just hit the up arrow key and xd randomly. Also, coking down again from the owl the pile of loose rock punch and it gives you points for knocking the rocks to reveal a raccoon.
Hitting the bushes too the nice pretty three grouped ya know will give a slim jim
Jump on the dresser looking thing too
You can still get point by getting stuff and throwing it at different people each time.
On the rumble, I just go straight at them ( keep them at their corner) once I can and keep hitting them not kicking and I win everytime.