Oh, I understand now. I got confused there for a bit.
The first 1/3rd of the show is pretty tame(maybe to show a contrast to later scenes), the weird stuff starts happening in the 2nd part, and some pretty crazy plot points happen in the 3rd. The whole time the show becomes more and more full of weird symbolism, and you become increasingly aware of how bizarre everyone acts all the time. Each character is living a lie, more or less, and you find that they were all acting very strangely on reflection.
And I'm not saying the show was really great or anything, I cant even say I enjoyed it a lot honestly. But its pretty interesting.
Also, if you don't ever plan on finishing the anime you might want to watch the movie, but don't watch the movie if you ever think you might watch the anime at some point, because it spoils some pretty important plot points.