Al the fight scenes have been performed by Nico Toffoli.
The Original name of the movie was Spyworld.
The Hotel "The Hive" has the rooms, the stairs, the hall and the room's wall made in hexagonal style, exactly like a real hive.
The Killers name has exactly the name of all the deadly spiders or bugs.
The name of the location is "The Hive Hotel" in Rome. So this is one of the rare occasions when the name of the Location in the Movie is the same name in the real-life.