When David meets Arnie in the Chinese restaurant, Arnie takes out a notebook. He opens it on the first page, with several ripped out pages. In the next scene, when he starts writing, the missing pages are gone and he is writing somewhere in the middle of the notebook. Later, the notebook is again shown with ripped out pages.
Right after Dave takes the soy sauce in Robert Marley's trailer (or rather, after the soy sauce burrows into his face), during his monologue that starts with "you are standing on the thin, cool crust of a gigantic ball of molten rock...", if you look closely you can see the bullet hole from when Detective Appleton shoots him in the chest. Dave getting shot happens a few minutes after this scene.