When John Wick travels to the Casablanca Continental, all the people in the background are clearly human. This is a subtle nod that Parabellum takes place on contemporary Earth, not a long time ago in the Mos Eisley Continental. Therefore, the titular war Wick is preparing for is a regular one, not Star Wars.
Damnable Humbuggery 
Hmmm… I haven’t thought about that detail in that perspective. Good one!
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