Half Nelson (1985)

Rocky Nelson is a New York City cop, who after making a major bust and selling the rights of his story to Hollywood decides to try his luck out as an actor. However, when he gets there, the directors think that he is too short to be an actor. He is then approached by someone who offers him a job at a Hollywood security agency, because he would fit in there being an ex-cop, and while working there, he could come in contact with some Hollywood heavyweights who could give him the break he needs, and at the same time, he gets to live in Dean Martin's guest house.