Character mistake: The woman with the AK-47 doesn't have the covers on the red dot optic open. In other words, she can't see her target.
Character mistake: Narrating, the Virtuoso said, "You leave your vehicle in long-term parking and rent a nondescript sedan. Dark colors are best." After the first murder, the Virtuoso drives away in a light-colored car (white or gray). (00:03:35 - 00:26:17)