1. Truman’s life is fake to the audience because everything in his life is being filmed on camera. We would assume that Truman’s life is fake because of the random commercials inserted into each character at points in the movie.
2.Truman is not fake because he is just a normal person living in the world just like everyone of us, but he is just not aware of the fact that his whole life is being filmed. However, he carries out the same routines each day which makes it a little suspicious that he is a machine and not a real human.
3.Truman begin to doubt reality when his first love told him that every is fake and to believe nothing. The actions of his friend and his wife(random commercials) also causes suspicion.