Millennium Actress (2001)
One of the movies within this movie is an homage, including the blood stained wooden walls, the elderly demon woman and Chiyoko's character's appearance.
One character in one of the films appears just like the main character of Yojimbo
The story of a filmmaker who recounts his life through his memoirs and movies, which is similar to the story of Chiyoko
Similarity of moonbase design
has the movie poster for Sennen joyu (2001) in this movie.
The movie poster is visible
compares themes to Perfect Blue
Genya speaks to his cameraman, that the documentary that they're making is going to be called "The Seven Ghosts" and appears a poster at the background similar to Akira Kurosawa's film while Genya makes a funny imitation of the Samurai Kambei
Chiyoko appears in a film quite similar, but is a giant robotic lizard