Continuity mistake: 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.

Kick-Ass (2010)
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Damon Macready: Tool up, honey bunny. It's time to get bad guys.
Trivia: 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.
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Chosen answer: It's a scar. No explanation is given as to how he got it - presumably it was added to the character's look to suggest a violent past.
Tailkinker ★