Continuity mistake: When walking along the cars at the start, John is level with the first car. Camera changes and now he is level with car 2. (00:06:45)
Continuity mistake: When the motorcycle hits Wick's car during the chase scene at the start, the motorcycle demolishes the front right quarter panel and door, with noticeable pieces hanging off the car. When Wick walks around the car to investigate the driver, the car appears to be in pristine condition. (00:02:05)
Answer: String Quartet in A Major, Op. 55, No. 1, by Joseph Haydn.