The director has come under fire from critics in the U.K. who claim the film is too violent for the big screen, and that 13-year-old actress Chloe Moretz should not have been cast as assassin Hit Girl, a character who uses bad language throughout the movie.
But Vaughn is adamant the controversy has been blown out of proportion - because he hasn't received one complaint from anybody who has seen the film.
He tells Britain's The One Show, "I actually don't think there will be (complains from parents). When people see the film they'll be surprised. I haven't had one complaint from someone who's seen the movie yet.
"We put comedy in (the movie) to show (the violence) isn't real. It's based on one of the most successful comic books ever written so if I didn't put the controversy in the fans would have killed me."