Dave Lizewski: How do I get a hold of you?
Hit Girl: You just contact the mayor's office, he has a special signal he shines in the sky. It's in the shape of a giant cock.
When the 3 guys are kicking a single guy with Kick-Ass defending him and a bunch of people behind watching the fight, the trashcan on the ground keeps changing positions between shots.
The lead character Kick Ass AKA Dave Lizewski got his 'real' name in response to a competition held to give Kick Ass his alter ego. Not surprisingly, the person who won the competition is also called Dave Lizewski and opted to use his own name.