Quote 16
Essentially [LSD] is twelve hours of schizophrenia. (3.2.3)
Wait, LSD? We thought Charlie was talking about a day he spent with Gary Busey.
Quote 17
Sam went on to explain what she called "the trance." The trance happens when you don't focus on anything, and the whole big picture swallows and moves around you. (3.2.25)
Here Sam is talking about one of the effects of LSD, but the same could be said about Charlie even when he's not doing the drug, don't you think? He has a tendency to let the world swallow him whole and move around him—and he doesn't do anything about it.
Quote 18
After a week of not talking to anyone, I finally called Bob. [...] He said he had a quarter ounce of pot left. So, I took some of my Easter money and bought it. I've been smoking it all the time since. (3.12.16)
When most people buy Easter grass, they're buying piles of that green plastic-y stuff that goes in baskets. The fact that Charlie uses his Easter money to buy drugs highlights how much his childhood innocence has been corrupted.