I was wondering if the Rin appearance was true or not as you can never be sure with some people so I'm glad to get some backup from here on that. I also had heard that Junichirou Takagi had made an appearance at some point in the movie, is this true? Also I was wondering how is Chihaya taking up photography handled? It's mentioned in her summary and shown in the trailer so I figured it's important, just like how Miki's summary mentions Hollywood and that shows up towards the end
Well, President Takagi made an appearance in the movie of course. He IS the production's president after all. :p
Though if by 'made an appearance' you meant his face was shown, then no, his face was never shown in the movie.
Chihaya taking up photography and Miki being in Hollywood wasn't very focused on at all. They weren't even very relevant to the plot of the movie. There's only a few times you see Chihaya taking pictures and Miki being in Hollywood was only shown in the movie credits. As a still picture. :/