We all like a little mystery in our lives. But sometimes, in advertising, there are certain things we kind of need to know. Product name. Product purpose. And of course, when advertising a movie, the title is a pretty clutch detail - most of the time. Whoever spearheaded the subway advertisements for The Northman disagreed with this notion, or straight up forgot to include the film's name. It could be argued that the stars of the Viking epic ( Nicole Kidman , Alexander Skarsgard , Ethan Hawke )…