Birdman explained

Rating: 10/10 (6 February 2015)

first of all great acting, AMAZING directing and cinematography. it is one of those movies where you don't care what the movie is about, you just want to enjoy the camera movement. however, the writing was also great. this movie is deep sh*t kinda movie, and once in a while I like watching such one. it is all "read between the lines" scenes, and here is my own interpretation of it.
the movie appears to be one long shot except of the last 10 minutes (for a reason I'll explain later) and this one shot is the life of Riggan from his point of view. it was edited in such a way to make us engage in his life and step into his shoes to understand him more. Riggan is a man of low self worth and confuses happiness with admiration, and so he always seek people's admiration and approval. he left Hollywood and his multimillion franchise film to create and star in a play which he does not like to be in just to make people believe in his talent. this shows when Birdman talks to him all the time and he imagine himself flying and having superpowers as what he really loved was Birdman and being famous but he left all that to the the "artist" that people respect.
the superpower is his secret wish. he wants this very much because he is very vulnerable and peoples opinions get into him easily. he just wishes to control the world and destroy all haters. the superpower wishes are getting worse in his mind to the point where he started to get delusional. this shows in many scenes. one scene is where he saw the light dangling but did nothing about it so it hit that actor he hated. later on he was convinced that he did that using his superpower, where what really happened is that he just saw it moving then falling and just thought he did that.
at the end, Riggan shot himself in the stage and there where he really died. this is evidence by the shot of the jellyfish (where he told his ex wife he tried to kill himself before and jellyfish attacked him). here where he got all what he ever wanted, a standing ovation, the critics walks away and he finally becomes famous. he took a real gun based on Mike's suggestion as he will do anything to please people and get approval. also after that scene the movie cuts and start to have different style of cinematography and lighting and this means that the scenes after he shot himself are not part of his life as he is already dead. in the hospital he had patches like Birdman and when he removed them he looked like him. this means that he finally became what he always wanted to be after he died, famous. and when he threw himself out of the window it was just a metaphor of being finally free. and his daughter smiling when she saw him symbolizes that she finally saw him for what he really is and forgave him and finally had her peace.