Lewis Dinkum's various antics, especially the Bloody Hilarioustaking out a guy with a flare gun.
Not to mention the telephone pole incident.
Old innocent-seeming Mrs. Salazar blasting a mook right out a window with her rifle for trespassing.
"Put the hurt on 'em, Ray!"
Later on, when she's talking to the FBI:
(indignantly) "That's why I shot him!"
"How are ya, Sheriff?" "Old"
The Brick Joke of "Well, next time don't park it in the fire zone."
After a while, the helpful sticky notes giving you useful information are replaced by sticky notes saying "Remember to write tomorrow's note" and "Call Mum if I live."
The first game at one point notes "Great, the fats ones are running now".
Although most of the descriptions of weapons in Union City are plain and uninteresting, there are a few "Joke Weapons" here and there: the highlights include the Cricket Bat ("Pretty sure the Australians invented this"), the Hockey Stick ("Some kind of Canadian Egg Flipper") and, of course, the Golf Club (simply listed as "FORE!!!").
Upon arriving at the hospital in Union City you find a note scribbled on the wall (Right next to a HERC Quarantine Notice).