In an interview with 'Rudy's Movie Reviews", Kevin Nash stated he was told the reason his character, Francis the bouncer, was allowed to live. Nash said that when Wick mentions he had lost some weight and Francis stated he had lost 20 kg, Wick was asking in code how many hostiles were in the building. Francis' reply was 20. Because he provided the information to Wick he was allowed to live.
According to the directors' commentary, when they shot the top-level nightclub fight sequence, Keanu Reeves had the flu, and was running a 104° fever. "You couldn't even get him to sit down," said Chad Stahelski. "He just did take after take."