Director: Matthew Vaughn
Stars: Aaron Taylor-Johnson, Nicolas Cage, ChloŽ Grace Moretz
Plot: Dave Lizewski is an unnoticed high school student and comic book fan with a few friends and who lives alone with his father. His life is not very difficult and his personal trials not that overwhelming. However, one day he makes the simple decision to become a super-hero even though he has no powers or training.
Nicolas Cage modeled his speech mannerisms as Big Daddy on original Batman Adam West.
In the final lines of the movie, Red Mist says: "As a great man once said: Wait 'till they get a load of me." He is quoting Jack Nicholson playing the Joker in the 1989 Batman movie.
In the comic, Big Daddy's backstory about being an ex-cop was a lie. He was an accountant who was bored with his life and kidnapped his daughter and made her into a vigilante. Many fans preferred the film version, including Mark Millar, who said that it "would have messed up the structure of the movie".
The name of the lead character Dave Lizewski was chosen at a charity auction run by Kick-Ass co-creator/writer Mark Millar prior to the publication of the 1st issue of the book. The auction winner chose his own name to be used.
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."
Big Daddy's line, "Now go to Robin's revenge!" is a reference to a Robin comic where Robin was fighting a blind master martial artist. Even though he was blind, his skill was such that Robin could not lay a finger on him. Robin was able to set up a whistle to blow automatically. This overloaded the blind man's primary sense and allowed Robin to sneak up behind him.
Nicolas Cage came up with his character's "disguise": that Damon Macready would have a mustache, while "Big Daddy" would have an even larger mustache via adhesive extensions.
According to Mark Millar, the "C-word" moment in issue three of the comic ultimately convinced Matthew Vaughn that it was a worthy project.
Stan Lee has a cameo as a man watching news footage.
In the original comic, Kick Ass does not get the girl in the end.
Red Mist" is a term that has been used to refer to a bomb-disposal person who gets blown up by the bomb they were trying to defuse. This is (basically) what actually happens to Frank D'Amico, the father of the "Red Mist" character, near the end of the movie.