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Contest Winner Cameo: Kind of, but going a bit beyond it: Dave Lizewski, winner of a charity auction and contest to name the main character, named him after himself. Which is rather fortunate because he could have named the character anything from Betty to Captain Ass if he wanted to.
Name's the Same: Hit Girl's civilian identity, Mindy McCready, shares her name with an all too real, troubled country singer who committed suicide in 2013.
While Big Daddy questioning Hit-Girl on John Woo was in the comics, it helps that he starred in one John Woo directed film, Face/Off.
The Danza: Christopher Mintz-Plasse plays Chris D'Amico.
Dawson Casting: Christopher Mintz-Plasse (Red Mist) and Lyndsy Fonseca (Katie), as well as several other actors, are in their early 20's yet play teenage characters. Somewhat averted with Kick-Ass himself, Aaron Johnson was 19 when the film was released.
Development Hell: The sequel. It was initially announced to be made for a 2012/2013 release but is on hold due to Aaron Johnson taking time off acting to be with his daughter and Matthew Vaughn directing other projects. It's now set to a 2013 release and to be directed by Jeff Wadlow (with Vaughn's blessing/supervision).
It seems that before ending up in Lionsgate Studios, the producers of the movie tried several other studios who all had the same ultimatum: "We'll take it, if you drop Hit-Girl or make her 19." Thankfully, they didn't.
The entire reason Red Mist survives the end of Kick-Ass 2 is because when Mark Millar told Jeff Wadlow (Director & writer of the second movie) of the character's death, he argued that they couldn't kill the character off as he's one of the series' staple characters & they couldn't really do Kick-Ass 3 without the character.
Fake American: Aaron Johnson (Dave) and Mark Strong (Frank D'Amico) are both English. Also, Jason Flemyng and Dexter Fletcher, who play two of D'Amico's henchmen.