I saw this article about Hitchcock’s Psycho
http://dramatica.com/articles/psycho
that talks about the two complete storyforms, one leading to the next, in the film.
Any further examples of movies that deploy multiple complete storyforms weaved in an interesting way, that give the same engrossing wtf feeling of Psycho? (excluding here works that show parallel multiple storyforms at once, like GoT or early star wars)