The movie suggests that the first killing by the assassin was in the shisha bar "Midnight", where he killed various people. While it is true that was there and killed the owner, but in real life before that he killed three pedestrians at the Neumarkt. Also the killing at the bar "La Votre" was before "Midnight", no after, as portrayed in the movie.
When the guy who is following Tobias is talking on his cellphone in his car, while holding it to his face, you can clearly see that the the phone screen is bright. If you are calling someone on a smartphone and holding it to your face, as shown by the character, the screen should have been dark.
In the scene in the newsagent's store there are various boulevard magazines from 2019 visible, including "Die Aktuelle" from autumn 2019. The story however takes place in February 2020.
However when Tobias is walking down the street early in the movie a sign for the ship "Mainz" is visible, as well as an ad for a restaurant in Mainz, which indicates that the movie was filmed in Mainz, Rhineland Pfalz.