The movie Mank has elements of truth in it. It's based on certain real aspects of the Hollywood industry and some characters who existed, but it's not a straightforward documentary-like account of a specific true story.
I'm not sure specifically what the'mank real story' is as it could refer to many things. It might be a personal story of someone named Mank, or it could be a local or specific event related to a group or place named Mank.
Yes, '1408' is based on a true story. The story was inspired by a Stephen King short story of the same name. It's about a man who stays in a supposedly haunted hotel room, Room 1408, and experiences terrifying and inexplicable events.
Well, it's a bit of a mix. While it may be inspired by some true elements from 1899 such as the general state of the world, sea travel, and social hierarchies at that time, it also has a lot of fictional elements added for the sake of drama and mystery. For example, the overarching mystery plot might be a creative take on some historical uncertainties, but not directly based on a single true story.