This black & white film was directed by Richard Lester, famous for his Beatles films ("A Hard Day's Night", "Help"), Musketeers films ("Three" and "Four") and other "zany" flicks (e.g., "The Bed Sitting Room"). "The Knack" was named Best Picture at the 1965 Cannes Film Festival.
The music was done by John Barry, who also did the score for "The Deep".
"The Knack" is available on video.