Deep? Or Simply Depraved?
I'm still debating with myself whether this film is a brilliant piece of work spotlighting the surreal psychosis of a severely fractured mind, or merely a seriously depraved venture into shock cinema. It's a tough call.
That intense deprivation and deeply disturbing events and imagery is present isn't up for debate, so let's set that aside and focus on the "story." It's billed as being about a demonic dog taking several children on hellrides, or at least that's the writeup on IMDB. However, it certainly appears as if we're viewing time and events through the thoroughly twisted, utterly garbled lens of a schizophrenic mind.
The various characters encountered often exhibit overlapping tidbits of back-story; not just location (which is a given), but in personal history. For example, the adult "memory killer," during a flashback, has a picture on the wall behind him, drawn by a child (logically assumed to be his), apologizing for something that the first young boy claimed was his fault, even though he's supposed to be the second boy, now grown. Little snippets like this, along with identical "satanic" and equally fractured imagery between protagonists, gives the impression that these are all splinters from the same mangled psyche. In other words, it appeared to me that the three young boys, as well as the adult "memory killer," are all the same person, suffering both intense schizophrenia and multiple personalities (the latter justified and explained in the adult "Tommy's" mind by his belief in Liquid Memories).
Ultimately everything comes full-circle, but is it indeed one story seen from multiple, broken perspectives, or is it truly intended to be just a neighborhood full of kids with really poor taste in homicidal, not-so-imaginary anthropomorphic friends?
I'm reminded of how, with Donnie Darko, if you really wanted to understand how and why everything happened, you had to go online and search for Roberta Sparrow's book on the Tangent Universe. WTDGTD similarly needs something for viewers to turn to afterwards to see if they've interpreted it correctly, or completely missed the mark (or maybe a bit of both). It would be nice to be able to read the author's thoughts on what his motivation and intent was with the story.