'Birdman' and 'Bullets Over Broadway': Homage or plagiarism?

TV adverts based on stolen ideas are so commonplace that Private Eye has a regular item devoted to the phenomenon. This endless recycling of ideas reached a peak of blatancy when artist Gillian Wearing complained that a Saatchi TV advert for VW was based on one of her artworks that she had sold to Charles Saatchi. This habit is perhaps not too surprising in such an ephemeral and profuse medium. Blatant idea theft is, however, more startling when you see it in a feature film that has won four Os